diff --git a/glide.lock b/glide.lock
index 86d96f83..59c21b79 100644
--- a/glide.lock
+++ b/glide.lock
@@ -1,8 +1,8 @@
-hash: 7227d566f4817cbb8b1eb609aeb5928f1bc420f763fbf387d5effcfa2e8e6509
-updated: 2018-09-11T13:25:49.903968+01:00
+hash: bb2fdd0ae1ce4cc20cd04c5fb3720722f46051ec869b6e61e21d9b8e7f020081
+updated: 2018-10-17T23:52:04.807878+01:00
 imports:
 - name: cloud.google.com/go
-  version: c728a003b238b26cef9ab6753a5dc424b331c3ad
+  version: dfffe386c33fb24c34ee501e5723df5b97b98514
   subpackages:
   - compute/metadata
   - iam
@@ -39,7 +39,7 @@ imports:
 - name: github.com/armon/go-metrics
   version: 3c58d8115a78a6879e5df75ae900846768d36895
 - name: github.com/aws/aws-sdk-go
-  version: 71a2a92b0063297b055b6f5a014d441c142da2ce
+  version: 66832f7f150914a46ffbfc03210f3b9cb0e4c005
   subpackages:
   - aws
   - aws/awserr
@@ -58,6 +58,7 @@ imports:
   - aws/request
   - aws/session
   - aws/signer/v4
+  - internal/s3err
   - internal/sdkio
   - internal/sdkrand
   - internal/sdkuri
@@ -139,6 +140,8 @@ imports:
   version: 80517062f582ea3340cd4baf70e86d539ae7d84d
   subpackages:
   - internal/load
+- name: github.com/konsorten/go-windows-terminal-sequences
+  version: 5c8c8bd35d3832f5d134ae1e1e375b69a4d25242
 - name: github.com/kr/text
   version: e2ffdb16a802fe2bb95e2e35ff34f0e53aeef34f
 - name: github.com/mattn/go-colorable
@@ -175,7 +178,7 @@ imports:
   subpackages:
   - diffmatchpatch
 - name: github.com/sirupsen/logrus
-  version: 3e01752db0189b9157070a0e1668a620f9a85da2
+  version: ad15b42461921f1fb3529b058c6786c6a45d5162
 - name: github.com/spf13/cobra
   version: ef82de70bb3f60c65fb8eebacbb2d122ef517385
 - name: github.com/spf13/pflag
diff --git a/glide.yaml b/glide.yaml
index 795c13ed..e2240417 100644
--- a/glide.yaml
+++ b/glide.yaml
@@ -33,7 +33,7 @@ import:
   subpackages:
   - diffmatchpatch
 - package: github.com/sirupsen/logrus
-  version: ^1.0.6
+  version: ^1.1.1
 - package: github.com/spf13/cobra
   version: ^0.0.3
 - package: github.com/ugorji/go
diff --git a/sql/funcs.go b/sql/funcs.go
index b77beb0c..5caffbf9 100644
--- a/sql/funcs.go
+++ b/sql/funcs.go
@@ -84,13 +84,11 @@ var funcs = map[string]map[int]interface{}{
 	"union":      {-1: nil},
 
 	// Count implementation
-
 	"count":     {1: nil},
 	"count.if":  {2: nil},
 	"count.not": {2: nil},
 
 	// Purge implementation
-
 	"purge":     {1: nil},
 	"purge.if":  {2: nil},
 	"purge.not": {2: nil},
@@ -217,6 +215,19 @@ var funcs = map[string]map[int]interface{}{
 	"scrypt.compare":  {2: nil},
 	"scrypt.generate": {1: nil},
 
+	// Check implementation
+	"is.alpha":       {1: nil},
+	"is.alphanum":    {1: nil},
+	"is.ascii":       {1: nil},
+	"is.domain":      {1: nil},
+	"is.email":       {1: nil},
+	"is.hexadecimal": {1: nil},
+	"is.latitude":    {1: nil},
+	"is.longitude":   {1: nil},
+	"is.numeric":     {1: nil},
+	"is.semver":      {1: nil},
+	"is.uuid":        {1: nil},
+
 	// Random implementation
 	"rand":                    {0: nil},
 	"guid":                    {0: nil},
diff --git a/sql/sql.go b/sql/sql.go
index 1fc2d637..0a673524 100644
--- a/sql/sql.go
+++ b/sql/sql.go
@@ -34,11 +34,9 @@ const (
 var (
 	allowedTypes = []string{
 		"array", "boolean", "circle",
-		"datetime", "domain", "double",
-		"email", "latitude", "longitude",
-		"number", "object", "password",
-		"phone", "point", "polygon",
-		"record", "string", "uuid",
+		"datetime", "number", "object",
+		"point", "polygon", "record",
+		"string", "uuid",
 	}
 
 	allowedAlgorithms = []string{
diff --git a/sql/sql_test.go b/sql/sql_test.go
index 4d96af0d..96cf9053 100644
--- a/sql/sql_test.go
+++ b/sql/sql_test.go
@@ -2709,29 +2709,11 @@ func Test_Parse_Queries_Define(t *testing.T) {
 		},
 		{
 			sql: `DEFINE FIELD temp ON person TYPE`,
-			err: "Found `` but expected `array, boolean, circle, datetime, domain, double, email, latitude, longitude, number, object, password, phone, point, polygon, record, string, uuid`",
+			err: "Found `` but expected `array, boolean, circle, datetime, number, object, point, polygon, record, string, uuid`",
 		},
 		{
 			sql: `DEFINE FIELD temp ON person TYPE something`,
-			err: "Found `something` but expected `array, boolean, circle, datetime, domain, double, email, latitude, longitude, number, object, password, phone, point, polygon, record, string, uuid`",
-		},
-		{
-			sql: `DEFINE FIELD temp ON person TYPE email`,
-			res: &Query{Statements: []Statement{&DefineFieldStatement{
-				KV: "*", NS: "*", DB: "*",
-				Name: &Ident{"temp"},
-				What: Tables{&Table{"person"}},
-				Type: "email",
-			}}},
-		},
-		{
-			sql: `DEFINE FIELD temp ON person TYPE phone`,
-			res: &Query{Statements: []Statement{&DefineFieldStatement{
-				KV: "*", NS: "*", DB: "*",
-				Name: &Ident{"temp"},
-				What: Tables{&Table{"person"}},
-				Type: "phone",
-			}}},
+			err: "Found `something` but expected `array, boolean, circle, datetime, number, object, point, polygon, record, string, uuid`",
 		},
 		{
 			sql: `DEFINE FIELD temp ON person TYPE array`,
@@ -2769,15 +2751,6 @@ func Test_Parse_Queries_Define(t *testing.T) {
 				Type: "number",
 			}}},
 		},
-		{
-			sql: `DEFINE FIELD temp ON person TYPE double`,
-			res: &Query{Statements: []Statement{&DefineFieldStatement{
-				KV: "*", NS: "*", DB: "*",
-				Name: &Ident{"temp"},
-				What: Tables{&Table{"person"}},
-				Type: "double",
-			}}},
-		},
 		{
 			sql: `DEFINE FIELD temp ON person TYPE record`,
 			res: &Query{Statements: []Statement{&DefineFieldStatement{
diff --git a/sql/string.go b/sql/string.go
index 96e6ccc8..521c3d27 100644
--- a/sql/string.go
+++ b/sql/string.go
@@ -127,6 +127,8 @@ func toQuote(s string) bool {
 			continue
 		case c == '.', c == '*':
 			continue
+		case c == '_':
+			continue
 		default:
 			return true
 		}
diff --git a/util/chck/chck.go b/util/chck/chck.go
deleted file mode 100644
index 685a72de..00000000
--- a/util/chck/chck.go
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright © 2016 Abcum Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package chck
-
-func IsBase64(s string) bool {
-	return rBase64.MatchString(s)
-}
-
-func IsDomain(s string) bool {
-	return rDomain.MatchString(s)
-}
-
-func IsEmail(s string) bool {
-	return rEmail.MatchString(s)
-}
-
-func IsLatitude(s string) bool {
-	return rLatitude.MatchString(s)
-}
-
-func IsLongitude(s string) bool {
-	return rLongitude.MatchString(s)
-}
-
-func IsPhone(s string) bool {
-	return rPhone.MatchString(s)
-}
-
-func IsUUID(s string) bool {
-	return rUUID.MatchString(s)
-}
diff --git a/util/chck/regex.go b/util/chck/regex.go
deleted file mode 100644
index 3099e5b6..00000000
--- a/util/chck/regex.go
+++ /dev/null
@@ -1,37 +0,0 @@
-// Copyright © 2016 Abcum Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package chck
-
-import "regexp"
-
-const (
-	sBase64    string = "^(?:[A-Za-z0-9+\\/]{4})*(?:[A-Za-z0-9+\\/]{2}==|[A-Za-z0-9+\\/]{3}=|[A-Za-z0-9+\\/]{4})$"
-	sDomain    string = `^([a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62}){1}(\.[a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62})*[\._]?$`
-	sEmail     string = "^(((([a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+(\\.([a-zA-Z]|\\d|[!#\\$%&'\\*\\+\\-\\/=\\?\\^_`{\\|}~]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])+)*)|((\\x22)((((\\x20|\\x09)*(\\x0d\\x0a))?(\\x20|\\x09)+)?(([\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]|\\x21|[\\x23-\\x5b]|[\\x5d-\\x7e]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(\\([\\x01-\\x09\\x0b\\x0c\\x0d-\\x7f]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}]))))*(((\\x20|\\x09)*(\\x0d\\x0a))?(\\x20|\\x09)+)?(\\x22)))@((([a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(([a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])([a-zA-Z]|\\d|-|\\.|_|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*([a-zA-Z]|\\d|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.)+(([a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])|(([a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])([a-zA-Z]|\\d|-|_|~|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])*([a-zA-Z]|[\\x{00A0}-\\x{D7FF}\\x{F900}-\\x{FDCF}\\x{FDF0}-\\x{FFEF}])))\\.?$"
-	sLatitude  string = "^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?)$"
-	sLongitude string = "^[-+]?(180(\\.0+)?|((1[0-7]\\d)|([1-9]?\\d))(\\.\\d+)?)$"
-	sPhone     string = `^[\s\d\+\-\(\)]+$`
-	sUUID      string = "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
-)
-
-var (
-	rBase64    = regexp.MustCompile(sBase64)
-	rDomain    = regexp.MustCompile(sDomain)
-	rEmail     = regexp.MustCompile(sEmail)
-	rLatitude  = regexp.MustCompile(sLatitude)
-	rLongitude = regexp.MustCompile(sLongitude)
-	rPhone     = regexp.MustCompile(sPhone)
-	rUUID      = regexp.MustCompile(sUUID)
-)
diff --git a/util/conv/conv.go b/util/conv/conv.go
index ac0e0800..b8c6cbb1 100644
--- a/util/conv/conv.go
+++ b/util/conv/conv.go
@@ -20,7 +20,6 @@ import (
 	"time"
 
 	"github.com/abcum/surreal/sql"
-	"github.com/abcum/surreal/util/chck"
 )
 
 func toNumber(str string) (float64, error) {
@@ -30,15 +29,6 @@ func toNumber(str string) (float64, error) {
 		err = fmt.Errorf("Expected a number, but found '%v'", str)
 
 	}
-	return float64(int64(val)), err
-}
-
-func toDouble(str string) (float64, error) {
-	val, err := strconv.ParseFloat(str, 64)
-	if err != nil {
-		val = 0.0
-		err = fmt.Errorf("Expected a number, but found '%v'", str)
-	}
 	return float64(val), err
 }
 
@@ -117,63 +107,23 @@ func ConvertTo(t, k string, obj interface{}) (val interface{}, err error) {
 	switch t {
 	default:
 		return obj, nil
-	case "uuid":
-		return ConvertToUuid(obj)
-	case "email":
-		return ConvertToEmail(obj)
-	case "phone":
-		return ConvertToPhone(obj)
 	case "array":
 		return ConvertToArray(obj)
 	case "object":
 		return ConvertToObject(obj)
-	case "domain":
-		return ConvertToDomain(obj)
-	case "base64":
-		return ConvertToBase64(obj)
 	case "string":
 		return ConvertToString(obj)
 	case "number":
 		return ConvertToNumber(obj)
-	case "double":
-		return ConvertToDouble(obj)
 	case "boolean":
 		return ConvertToBoolean(obj)
 	case "datetime":
 		return ConvertToDatetime(obj)
-	case "latitude":
-		return ConvertToLatitude(obj)
-	case "longitude":
-		return ConvertToLongitude(obj)
 	case "record":
 		return ConvertToRecord(obj, k)
 	}
 }
 
-func ConvertToUuid(obj interface{}) (val string, err error) {
-	val = fmt.Sprintf("%v", obj)
-	if !chck.IsUUID(val) {
-		err = fmt.Errorf("Expected a UUID, but found '%v'", obj)
-	}
-	return
-}
-
-func ConvertToEmail(obj interface{}) (val string, err error) {
-	val = fmt.Sprintf("%v", obj)
-	if !chck.IsEmail(val) {
-		err = fmt.Errorf("Expected an email address, but found '%v'", obj)
-	}
-	return
-}
-
-func ConvertToPhone(obj interface{}) (val string, err error) {
-	val = fmt.Sprintf("%v", obj)
-	if !chck.IsPhone(val) {
-		err = fmt.Errorf("Expected a phone number, but found '%v'", obj)
-	}
-	return
-}
-
 func ConvertToArray(obj interface{}) (val []interface{}, err error) {
 	if now, ok := obj.([]interface{}); ok {
 		val = now
@@ -192,22 +142,6 @@ func ConvertToObject(obj interface{}) (val map[string]interface{}, err error) {
 	return
 }
 
-func ConvertToDomain(obj interface{}) (val string, err error) {
-	val = fmt.Sprintf("%v", obj)
-	if !chck.IsDomain(val) {
-		err = fmt.Errorf("Expected a domain name, but found '%v'", obj)
-	}
-	return
-}
-
-func ConvertToBase64(obj interface{}) (val string, err error) {
-	val = fmt.Sprintf("%v", obj)
-	if !chck.IsBase64(val) {
-		err = fmt.Errorf("Expected base64 data, but found '%v'", obj)
-	}
-	return
-}
-
 func ConvertToString(obj interface{}) (val string, err error) {
 	switch now := obj.(type) {
 	case string:
@@ -232,19 +166,6 @@ func ConvertToNumber(obj interface{}) (val float64, err error) {
 	}
 }
 
-func ConvertToDouble(obj interface{}) (val float64, err error) {
-	switch now := obj.(type) {
-	case int64:
-		return float64(now), err
-	case float64:
-		return float64(now), err
-	case string:
-		return toDouble(now)
-	default:
-		return toDouble(fmt.Sprintf("%v", obj))
-	}
-}
-
 func ConvertToBoolean(obj interface{}) (val bool, err error) {
 	switch now := obj.(type) {
 	case int64:
@@ -270,22 +191,6 @@ func ConvertToDatetime(obj interface{}) (val time.Time, err error) {
 	return
 }
 
-func ConvertToLatitude(obj interface{}) (val float64, err error) {
-	str := fmt.Sprintf("%v", obj)
-	if !chck.IsLatitude(str) {
-		err = fmt.Errorf("Expected a latitude value, but found '%v'", obj)
-	}
-	return toNumber(str)
-}
-
-func ConvertToLongitude(obj interface{}) (val float64, err error) {
-	str := fmt.Sprintf("%v", obj)
-	if !chck.IsLongitude(str) {
-		err = fmt.Errorf("Expected a longitude value, but found '%v'", obj)
-	}
-	return toNumber(str)
-}
-
 func ConvertToRecord(obj interface{}, tb string) (val *sql.Thing, err error) {
 	switch now := obj.(type) {
 	case *sql.Thing:
diff --git a/util/fncs/email.go b/util/fncs/email.go
index f41feb62..6bcecc6c 100644
--- a/util/fncs/email.go
+++ b/util/fncs/email.go
@@ -17,8 +17,6 @@ package fncs
 import (
 	"context"
 	"strings"
-
-	"github.com/abcum/surreal/util/chck"
 )
 
 func emailUser(ctx context.Context, args ...interface{}) (interface{}, error) {
@@ -36,8 +34,3 @@ func emailDomain(ctx context.Context, args ...interface{}) (interface{}, error)
 	}
 	return nil, nil
 }
-
-func emailValid(ctx context.Context, args ...interface{}) (interface{}, error) {
-	v, _ := ensureString(args[0])
-	return chck.IsEmail(v), nil
-}
diff --git a/util/fncs/email_test.go b/util/fncs/email_test.go
index c6f43a50..81b097bb 100644
--- a/util/fncs/email_test.go
+++ b/util/fncs/email_test.go
@@ -47,14 +47,4 @@ func TestEmail(t *testing.T) {
 		So(res, ShouldEqual, nil)
 	})
 
-	Convey("email.valid(a) works properly", t, func() {
-		res, _ := Run(context.Background(), "email.valid", "tobie@abcum.com")
-		So(res, ShouldEqual, true)
-	})
-
-	Convey("email.valid(a) errors properly", t, func() {
-		res, _ := Run(context.Background(), "email.valid", "test")
-		So(res, ShouldEqual, false)
-	})
-
 }
diff --git a/util/fncs/fnc.go b/util/fncs/fnc.go
index 80c233b1..5c049bd0 100644
--- a/util/fncs/fnc.go
+++ b/util/fncs/fnc.go
@@ -272,8 +272,6 @@ func Run(ctx context.Context, name string, args ...interface{}) (interface{}, er
 		return emailUser(ctx, args...)
 	case "email.domain":
 		return emailDomain(ctx, args...)
-	case "email.valid":
-		return emailValid(ctx, args...)
 
 	// Bcrypt implementation
 	case "bcrypt.compare":
@@ -287,6 +285,30 @@ func Run(ctx context.Context, name string, args ...interface{}) (interface{}, er
 	case "scrypt.generate":
 		return scryptGenerate(ctx, args...)
 
+	// Check implementation
+	case "is.alpha":
+		return isAlpha(ctx, args...)
+	case "is.alphanum":
+		return isAlphanum(ctx, args...)
+	case "is.ascii":
+		return isAscii(ctx, args...)
+	case "is.domain":
+		return isDomain(ctx, args...)
+	case "is.email":
+		return isEmail(ctx, args...)
+	case "is.hexadecimal":
+		return isHexadecimal(ctx, args...)
+	case "is.latitude":
+		return isLatitude(ctx, args...)
+	case "is.longitude":
+		return isLongitude(ctx, args...)
+	case "is.numeric":
+		return isNumeric(ctx, args...)
+	case "is.semver":
+		return isSemver(ctx, args...)
+	case "is.uuid":
+		return isUuid(ctx, args...)
+
 	// Rand implementation
 	case "rand":
 		return rand(ctx, args...)
diff --git a/util/fncs/is.go b/util/fncs/is.go
new file mode 100644
index 00000000..fb2ecca3
--- /dev/null
+++ b/util/fncs/is.go
@@ -0,0 +1,125 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fncs
+
+import (
+	"context"
+	"net/mail"
+	"regexp"
+)
+
+const (
+	sAlpha       string = "^[a-zA-Z]+$"
+	sAlphanum    string = "^[a-zA-Z0-9]+$"
+	sAscii       string = "^[\x00-\x7F]+$"
+	sDomain      string = `^([a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62}){1}(\.[a-zA-Z0-9_]{1}[a-zA-Z0-9_-]{0,62})*[\._]?$`
+	sHexadecimal string = "^[0-9a-fA-F]+$"
+	sLatitude    string = "^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?)$"
+	sLongitude   string = "^[-+]?(180(\\.0+)?|((1[0-7]\\d)|([1-9]?\\d))(\\.\\d+)?)$"
+	sNumeric     string = "^[0-9]+$"
+	sSemver      string = "^v?(?:0|[1-9]\\d*)\\.(?:0|[1-9]\\d*)\\.(?:0|[1-9]\\d*)(-(0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(\\.(0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*)?(\\+[0-9a-zA-Z-]+(\\.[0-9a-zA-Z-]+)*)?$"
+	sUUID        string = "^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
+)
+
+var (
+	rAlpha       = regexp.MustCompile(sAlpha)
+	rAlphanum    = regexp.MustCompile(sAlphanum)
+	rAscii       = regexp.MustCompile(sAscii)
+	rDomain      = regexp.MustCompile(sDomain)
+	rHexadecimal = regexp.MustCompile(sHexadecimal)
+	rLatitude    = regexp.MustCompile(sLatitude)
+	rLongitude   = regexp.MustCompile(sLongitude)
+	rNumeric     = regexp.MustCompile(sNumeric)
+	rSemver      = regexp.MustCompile(sSemver)
+	rUUID        = regexp.MustCompile(sUUID)
+)
+
+func isAlpha(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rAlpha.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isAlphanum(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rAlphanum.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isAscii(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rAscii.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isDomain(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rDomain.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isEmail(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); len(val) > 0 && ok {
+		pse, err := mail.ParseAddress(val)
+		return err == nil && val == pse.Address, nil
+	}
+	return false, nil
+}
+
+func isHexadecimal(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rHexadecimal.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isLatitude(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rLatitude.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isLongitude(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rLongitude.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isNumeric(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rNumeric.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isSemver(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rSemver.MatchString(val), nil
+	}
+	return false, nil
+}
+
+func isUuid(ctx context.Context, args ...interface{}) (interface{}, error) {
+	if val, ok := ensureString(args[0]); ok {
+		return rUUID.MatchString(val), nil
+	}
+	return false, nil
+}
diff --git a/util/fncs/is_test.go b/util/fncs/is_test.go
new file mode 100644
index 00000000..0343f845
--- /dev/null
+++ b/util/fncs/is_test.go
@@ -0,0 +1,151 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fncs
+
+import (
+	"context"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestIs(t *testing.T) {
+
+	var res interface{}
+
+	Convey("is.alpha(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.alpha", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.alpha", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.alpha", "aBcDe")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.alphanum(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.alphanum", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.alphanum", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.alphanum", "aB3De")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.ascii(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.ascii", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.ascii", "testing®")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.ascii", "aB3De")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.domain(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.domain", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.domain", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.domain", "abcum.com")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.email(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.email", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.email", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.email", "info@abcum.com")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.hexadecimal(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.hexadecimal", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.hexadecimal", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.hexadecimal", "00bfff")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.latitude(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.latitude", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.latitude", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.latitude", 0)
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.latitude", -90)
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.latitude", +90)
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.latitude", "-90")
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.latitude", "+90")
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.latitude", -95)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.latitude", +95)
+		So(res, ShouldEqual, false)
+	})
+
+	Convey("is.longitude(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.longitude", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.longitude", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.longitude", 0)
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.longitude", -180)
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.longitude", +180)
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.longitude", "-180")
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.longitude", "+180")
+		So(res, ShouldEqual, true)
+		res, _ = Run(context.Background(), "is.longitude", -185)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.longitude", +185)
+		So(res, ShouldEqual, false)
+	})
+
+	Convey("is.numeric(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.numeric", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.numeric", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.numeric", "123456")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.semver(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.semver", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.semver", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.semver", "1.0.32")
+		So(res, ShouldEqual, true)
+	})
+
+	Convey("is.uuid(a) works properly", t, func() {
+		res, _ = Run(context.Background(), "is.uuid", nil)
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.uuid", "test-©")
+		So(res, ShouldEqual, false)
+		res, _ = Run(context.Background(), "is.uuid", "8ddb11e8-755f-47cf-a84f-8033d1cfa1b9")
+		So(res, ShouldEqual, true)
+	})
+
+}