{"id":21502393,"url":"https://github.com/night-codes/goback","last_synced_at":"2025-07-16T21:12:58.558Z","repository":{"id":83544900,"uuid":"63345385","full_name":"night-codes/goback","owner":"night-codes","description":"Yet another golang regexp","archived":false,"fork":false,"pushed_at":"2015-03-02T05:52:33.000Z","size":1417,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-01-23T23:32:53.937Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"Go","has_issues":false,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":"flyingtime/goback","license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/night-codes.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null}},"created_at":"2016-07-14T14:52:52.000Z","updated_at":"2023-04-10T10:51:49.000Z","dependencies_parsed_at":"2023-02-25T15:40:25.423Z","dependency_job_id":null,"html_url":"https://github.com/night-codes/goback","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/night-codes%2Fgoback","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/night-codes%2Fgoback/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/night-codes%2Fgoback/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/night-codes%2Fgoback/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/night-codes","download_url":"https://codeload.github.com/night-codes/goback/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":244043499,"owners_count":20388591,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-11-23T18:14:44.855Z","updated_at":"2025-03-17T13:40:52.887Z","avatar_url":"https://github.com/night-codes.png","language":"Go","funding_links":[],"categories":[],"sub_categories":[],"readme":"goback\n======\n\n[![Build Status](https://travis-ci.org/h2so5/goback.svg)](https://travis-ci.org/h2so5/goback)\n[![GoDoc](https://godoc.org/github.com/h2so5/goback/regexp?status.svg)](http://godoc.org/github.com/h2so5/goback/regexp)\n\ngoback provides extended regexp syntax, such as Back reference.\n\nThe implementation does **NOT** guarantee linear processing time.\n\n## Syntax\n\nSee http://godoc.org/github.com/h2so5/goback/regexp/syntax\n\n## Examples\n\n### Back reference\n\n```go\npackage main\n\nimport (\n\t\"fmt\"\n\t\"github.com/h2so5/goback/regexp\"\n)\n\nfunc main() {\n\tre := regexp.MustCompile(`^(\\w)\\w+\\k{1}$`)\n\tfmt.Println(re.MatchString(\"acca\"))       // true\n\tfmt.Println(re.MatchString(\"accccab\"))    // false\n\tfmt.Println(re.MatchString(\"AA\"))         // false\n}\n```\n\n### Possessive qualifiers\n\n```go\nre := regexp.MustCompile(`^[0-9]++[0-9a]`)\nfmt.Println(re.MatchString(\"1234a\"))     // true\nfmt.Println(re.MatchString(\"1234\"))      // false\n```\n\n### Atomic group\n\n```go\nre := regexp.MustCompile(`^(?\u003e[0-9]+)[0-9a]`)\nfmt.Println(re.MatchString(\"1234a\"))     // true\nfmt.Println(re.MatchString(\"1234\"))      // false\n```\n\n### Comment\n\n```go\nre := regexp.MustCompile(`(?#comment here)1234`)\nfmt.Println(re.MatchString(\"1234\"))      // true\n```\n\n### Lookahead\n\n```go\nre := regexp.MustCompile(`a(?=[0-9]{3})1`)\nfmt.Println(re.MatchString(\"a123\"))     // true\nfmt.Println(re.MatchString(\"a12a\"))     // false\n```\n\n### Lookbehind\n\n```go\nre := regexp.MustCompile(`(?\u003c=a[0-9]{3,5})a`)\nfmt.Println(re.MatchString(\"a12a\"))     // false\nfmt.Println(re.MatchString(\"a12345a\"))  // true\n```\n\n### Free-Spacing mode\n\n```go\nre := regexp.MustCompileFreeSpacing(`\n\n\t[0-9]+    # one or more digits\n\t[a-zA-Z]* # zero or more alphabets\n\t\\#        # literal '#'\n\t[ ]       # literal ' '\n\n`)\nfmt.Println(re.MatchString(\"1234# \"))     // true\nfmt.Println(re.MatchString(\"12345abc \"))  // false\n```\n\n### Function\n\n```go\nre := regexp.MustCompile(`(\\d+)\\+(\\d+)=(?{add})`)\n\nre.Funcs(syntax.FuncMap{\n\t\"add\": func(ctx syntax.Context) interface{} {\n\t\tlhs, err := strconv.Atoi(string(ctx.Data[ctx.Matches[1][0]:ctx.Matches[1][1]]))\n\t\tif err != nil {\n\t\t\treturn -1\n\t\t}\n\t\trhs, err := strconv.Atoi(string(ctx.Data[ctx.Matches[2][0]:ctx.Matches[2][1]]))\n\t\tif err != nil {\n\t\t\treturn -1\n\t\t}\n\t\tanswer := strconv.Itoa(lhs + rhs)\n\t\tif bytes.HasPrefix(ctx.Data[ctx.Cursor:], []byte(answer)) {\n\t\t\treturn len(answer)\n\t\t}\n\t\treturn -1\n\t},\n})\n\nfmt.Println(re.MatchString(\"12+10=22\")) // true\nfmt.Println(re.MatchString(\"1+1=5\"))    // false\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnight-codes%2Fgoback","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fnight-codes%2Fgoback","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fnight-codes%2Fgoback/lists"}