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regex.go
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/
regex.go
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// Copyright 2017-2019 Lei Ni (nilei81@gmail.com)
//
// 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 stringutil
import (
"net"
"regexp"
"strconv"
"strings"
)
var (
// HostnameRegex is the regex for valid hostnames.
HostnameRegex = regexp.MustCompile(`^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$`)
// IPV4Regex is the regex for valid IPv4 addresses.
IPV4Regex = regexp.MustCompile(`^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$`)
)
// IsValidAddress returns a boolean indicating whether the specified address
// is valid.
func IsValidAddress(addr string) bool {
in := strings.TrimSpace(addr)
parts := strings.Split(in, ":")
if len(parts) != 2 || len(parts[0]) == 0 || len(parts[1]) == 0 {
return false
}
i, err := strconv.Atoi(parts[1])
if err != nil || i <= 0 || i > 65535 {
return false
}
if HostnameRegex.MatchString(parts[0]) {
return true
}
if IPV4Regex.MatchString(parts[0]) {
if net.ParseIP(parts[0]) != nil {
return true
}
}
return false
}
// BytesDeepCopy ...
func BytesDeepCopy(b []byte) []byte {
ret := make([]byte, 0)
ret = append(ret, b...)
return ret
}