68 lines
2.6 KiB
Go
68 lines
2.6 KiB
Go
// Copyright (c) 2015, Daniel Martí <mvdan@mvdan.cc>
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// See LICENSE for licensing information
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// Package xurls extracts urls from plain text using regular expressions.
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package xurls
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import "regexp"
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//go:generate go run generate/tldsgen/main.go
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//go:generate go run generate/regexgen/main.go
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const (
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letter = `\p{L}`
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mark = `\p{M}`
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number = `\p{N}`
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iriChar = letter + mark + number
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currency = `\p{Sc}`
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otherSymb = `\p{So}`
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endChar = iriChar + `/\-+_&~*%=#` + currency + otherSymb
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otherPunc = `\p{Po}`
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midChar = endChar + `|` + otherPunc
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wellParen = `\([` + midChar + `]*(\([` + midChar + `]*\)[` + midChar + `]*)*\)`
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wellBrack = `\[[` + midChar + `]*(\[[` + midChar + `]*\][` + midChar + `]*)*\]`
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wellBrace = `\{[` + midChar + `]*(\{[` + midChar + `]*\}[` + midChar + `]*)*\}`
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wellAll = wellParen + `|` + wellBrack + `|` + wellBrace
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pathCont = `([` + midChar + `]*(` + wellAll + `|[` + endChar + `])+)+`
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comScheme = `[a-zA-Z][a-zA-Z.\-+]*://`
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scheme = `(` + comScheme + `|` + otherScheme + `)`
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iri = `[` + iriChar + `]([` + iriChar + `\-]*[` + iriChar + `])?`
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domain = `(` + iri + `\.)+`
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octet = `(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])`
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ipv4Addr = `\b` + octet + `\.` + octet + `\.` + octet + `\.` + octet + `\b`
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ipv6Addr = `([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:([0-9a-fA-F]{1,4}:[0-9a-fA-F]{0,4}|:[0-9a-fA-F]{1,4})?|(:[0-9a-fA-F]{1,4}){0,2})|(:[0-9a-fA-F]{1,4}){0,3})|(:[0-9a-fA-F]{1,4}){0,4})|:(:[0-9a-fA-F]{1,4}){0,5})((:[0-9a-fA-F]{1,4}){2}|:(25[0-5]|(2[0-4]|1[0-9]|[1-9])?[0-9])(\.(25[0-5]|(2[0-4]|1[0-9]|[1-9])?[0-9])){3})|(([0-9a-fA-F]{1,4}:){1,6}|:):[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){7}:`
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ipAddr = `(` + ipv4Addr + `|` + ipv6Addr + `)`
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site = domain + gtld
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hostName = `(` + site + `|` + ipAddr + `)`
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port = `(:[0-9]*)?`
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path = `(/|/` + pathCont + `?|\b|$)`
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webURL = hostName + port + path
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strict = `(\b` + scheme + pathCont + `)`
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relaxed = `(` + strict + `|` + webURL + `)`
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)
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var (
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// Relaxed matches all the urls it can find.
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Relaxed = regexp.MustCompile(relaxed)
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// Strict only matches urls with a scheme to avoid false positives.
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Strict = regexp.MustCompile(strict)
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)
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func init() {
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Relaxed.Longest()
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Strict.Longest()
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}
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// StrictMatchingScheme produces a regexp that matches urls like Strict but
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// whose scheme matches the given regular expression.
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func StrictMatchingScheme(exp string) (*regexp.Regexp, error) {
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strictMatching := `(\b(?i)(` + exp + `)(?-i)` + pathCont + `)`
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re, err := regexp.Compile(strictMatching)
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if err != nil {
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return nil, err
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}
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re.Longest()
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return re, nil
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}
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