mirror of https://github.com/k3s-io/k3s
54 lines
1.9 KiB
Go
54 lines
1.9 KiB
Go
/*
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Copyright 2014 Google Inc. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"regexp"
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)
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var dnsLabelFmt string = "[a-z0-9]([-a-z0-9]*[a-z0-9])?"
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var dnsLabelRegexp *regexp.Regexp = regexp.MustCompile("^" + dnsLabelFmt + "$")
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// IsDNSLabel tests for a string that conforms to the definition of a label in
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// DNS (RFC 1035/1123). This checks the format, but not the length.
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func IsDNSLabel(value string) bool {
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return dnsLabelRegexp.MatchString(value)
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}
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var dnsSubdomainFmt string = dnsLabelFmt + "(\\." + dnsLabelFmt + ")*"
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var dnsSubdomainRegexp *regexp.Regexp = regexp.MustCompile("^" + dnsSubdomainFmt + "$")
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// IsDNSSubdomain tests for a string that conforms to the definition of a
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// subdomain in DNS (RFC 1035/1123). This checks the format, but not the length.
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func IsDNSSubdomain(value string) bool {
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return dnsSubdomainRegexp.MatchString(value)
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}
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var cIdentifierFmt string = "[A-Za-z_][A-Za-z0-9_]*"
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var cIdentifierRegexp *regexp.Regexp = regexp.MustCompile("^" + cIdentifierFmt + "$")
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// IsCIdentifier tests for a string that conforms the definition of an identifier
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// in C. This checks the format, but not the length.
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func IsCIdentifier(value string) bool {
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return cIdentifierRegexp.MatchString(value)
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}
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// IsValidPortNum tests that the argument is a valid, non-zero port number.
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func IsValidPortNum(port int) bool {
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return 0 < port && port < 65536
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}
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