Use gitea forked macaron (#7933)

Signed-off-by: Tamal Saha <tamal@appscode.com>

vendor/github.com/unknwon/com/regex.go

@@ -0,0 +1,56 @@
+// Copyright 2013 com authors
+//
+// 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 com
+
+import "regexp"
+
+const (
+	regex_email_pattern        = `(?i)[A-Z0-9._%+-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,6}`
+	regex_strict_email_pattern = `(?i)[A-Z0-9!#$%&'*+/=?^_{|}~-]+` +
+		`(?:\.[A-Z0-9!#$%&'*+/=?^_{|}~-]+)*` +
+		`@(?:[A-Z0-9](?:[A-Z0-9-]*[A-Z0-9])?\.)+` +
+		`[A-Z0-9](?:[A-Z0-9-]*[A-Z0-9])?`
+	regex_url_pattern = `(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?`
+)
+
+var (
+	regex_email        *regexp.Regexp
+	regex_strict_email *regexp.Regexp
+	regex_url          *regexp.Regexp
+)
+
+func init() {
+	regex_email = regexp.MustCompile(regex_email_pattern)
+	regex_strict_email = regexp.MustCompile(regex_strict_email_pattern)
+	regex_url = regexp.MustCompile(regex_url_pattern)
+}
+
+// IsEmail validates string is an email address, if not return false
+// basically validation can match 99% cases
+func IsEmail(email string) bool {
+	return regex_email.MatchString(email)
+}
+
+// IsEmailRFC validates string is an email address, if not return false
+// this validation omits RFC 2822
+func IsEmailRFC(email string) bool {
+	return regex_strict_email.MatchString(email)
+}
+
+// IsUrl validates string is a url link, if not return false
+// simple validation can match 99% cases
+func IsUrl(url string) bool {
+	return regex_url.MatchString(url)
+}