Regular Expressions 101

Save & Share

  • Regex Version: ver. 3
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/

Test String

Code Generator

Language

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"((var|const|let)\s+)?[A-Za-z0-9_\.\[\]""\']+\s?=\s+?{"; string input = @"acf0.data = {""select2L10n"":{""matches_1"":""Es ist ein Ergebnis verf\u00fcgbar, dr\u00fccke die Eingabetaste um es auszuw\u00e4hlen."",""matches_n"":""Es sind %d Ergebnisse verf\u00fcgbar, benutze die Pfeiltasten um nach oben und unten zu navigieren."",""matches_0"":""Keine \u00dcbereinstimmungen gefunden"",""input_too_short_1"":""Gib bitte ein oder mehr Zeichen ein"",""input_too_short_n"":""Gib bitte %d oder mehr Zeichen ein"",""input_too_long_1"":""L\u00f6sche bitte ein Zeichen"",""input_too_long_n"":""L\u00f6sche bitte %d Zeichen"",""selection_too_long_1"":""Du kannst nur ein Element ausw\u00e4hlen"",""selection_too_long_n"":""Du kannst nur %d Elemente ausw\u00e4hlen"",""load_more"":""Mehr Ergebnisse laden&hellip;"",""searching"":""Suchen&hellip;"",""load_fail"":""Laden fehlgeschlagen""},""google_map_api"":""https:\/\/maps.googleapis.com\/maps\/api\/js?key=AIzaSyDzJU4YaeA4XDHAN1BvFOZD8A2eF5lxYr0&libraries=places&ver=3&callback&language=de_DE"",""datePickerL10n"":{""closeText"":""Fertig"",""currentText"":""Heute"",""nextText"":""N\u00e4chstes"",""prevText"":""Vorheriges"",""weekHeader"":""W"",""monthNames"":[""Januar"",""Februar"",""M\u00e4rz"",""April"",""Mai"",""Juni"",""Juli"",""August"",""September"",""Oktober"",""November"",""Dezember""],""monthNamesShort"":[""Jan"",""Feb"",""Mrz"",""Apr"",""Mai"",""Jun"",""Jul"",""Aug"",""Sep"",""Okt"",""Nov"",""Dez""],""dayNames"":[""Sonntag"",""Montag"",""Dienstag"",""Mittwoch"",""Donnerstag"",""Freitag"",""Samstag""],""dayNamesMin"":[""S"",""M"",""D"",""M"",""D"",""F"",""S""],""dayNamesShort"":[""So"",""Mo"",""Di"",""Mi"",""Do"",""Fr"",""Sa""]},""dateTimePickerL10n"":{""timeOnlyTitle"":""Zeit ausw\u00e4hlen"",""timeText"":""Zeit"",""hourText"":""Stunde"",""minuteText"":""Minute"",""secondText"":""Sekunde"",""millisecText"":""Millisekunde"",""microsecText"":""Mikrosekunde"",""timezoneText"":""Zeitzone"",""currentText"":""Jetzt"",""closeText"":""Fertig"",""selectText"":""Ausw\u00e4hlen"",""amNames"":[""Vorm."",""Vorm.""],""pmNames"":[""Nachm."",""Nachm.""]},""colorPickerL10n"":{""hex_string"":""Hex String"",""rgba_string"":""RGBA String""},""mimeTypeIcon"":""https:\/\/wptest.photoclub-reutlingen.de\/wp-includes\/images\/media\/default.png"",""mimeTypes"":{""jpg|jpeg|jpe"":""image\/jpeg"",""gif"":""image\/gif"",""png"":""image\/png"",""bmp"":""image\/bmp"",""tiff|tif"":""image\/tiff"",""webp"":""image\/webp"",""ico"":""image\/x-icon"",""heic"":""image\/heic"",""asf|asx"":""video\/x-ms-asf"",""wmv"":""video\/x-ms-wmv"",""wmx"":""video\/x-ms-wmx"",""wm"":""video\/x-ms-wm"",""avi"":""video\/avi"",""divx"":""video\/divx"",""flv"":""video\/x-flv"",""mov|qt"":""video\/quicktime"",""mpeg|mpg|mpe"":""video\/mpeg"",""mp4|m4v"":""video\/mp4"",""ogv"":""video\/ogg"",""webm"":""video\/webm"",""mkv"":""video\/x-matroska"",""3gp|3gpp"":""video\/3gpp"",""3g2|3gp2"":""video\/3gpp2"",""txt|asc|c|cc|h|srt"":""text\/plain"",""csv"":""text\/csv"",""tsv"":""text\/tab-separated-values"",""ics"":""text\/calendar"",""rtx"":""text\/richtext"",""css"":""text\/css"",""vtt"":""text\/vtt"",""dfxp"":""application\/ttaf+xml"",""mp3|m4a|m4b"":""audio\/mpeg"",""aac"":""audio\/aac"",""ra|ram"":""audio\/x-realaudio"",""wav"":""audio\/wav"",""ogg|oga"":""audio\/ogg"",""flac"":""audio\/flac"",""mid|midi"":""audio\/midi"",""wma"":""audio\/x-ms-wma"",""wax"":""audio\/x-ms-wax"",""mka"":""audio\/x-matroska"",""rtf"":""application\/rtf"",""pdf"":""application\/pdf"",""class"":""application\/java"",""tar"":""application\/x-tar"",""zip"":""application\/zip"",""gz|gzip"":""application\/x-gzip"",""rar"":""application\/rar"",""7z"":""application\/x-7z-compressed"",""psd"":""application\/octet-stream"",""xcf"":""application\/octet-stream"",""doc"":""application\/msword"",""pot|pps|ppt"":""application\/vnd.ms-powerpoint"",""wri"":""application\/vnd.ms-write"",""xla|xls|xlt|xlw"":""application\/vnd.ms-excel"",""mdb"":""application\/vnd.ms-access"",""mpp"":""application\/vnd.ms-project"",""docx"":""application\/vnd.openxmlformats-officedocument.wordprocessingml.document"",""docm"":""application\/vnd.ms-word.document.macroEnabled.12"",""dotx"":""application\/vnd.openxmlformats-officedocument.wordprocessingml.template"",""dotm"":""application\/vnd.ms-word.template.macroEnabled.12"",""xlsx"":""application\/vnd.openxmlformats-officedocument.spreadsheetml.sheet"",""xlsm"":""application\/vnd.ms-excel.sheet.macroEnabled.12"",""xlsb"":""application\/vnd.ms-excel.sheet.binary.macroEnabled.12"",""xltx"":""application\/vnd.openxmlformats-officedocument.spreadsheetml.template"",""xltm"":""application\/vnd.ms-excel.template.macroEnabled.12"",""xlam"":""application\/vnd.ms-excel.addin.macroEnabled.12"",""pptx"":""application\/vnd.openxmlformats-officedocument.presentationml.presentation"",""pptm"":""application\/vnd.ms-powerpoint.presentation.macroEnabled.12"",""ppsx"":""application\/vnd.openxmlformats-officedocument.presentationml.slideshow"",""ppsm"":""application\/vnd.ms-powerpoint.slideshow.macroEnabled.12"",""potx"":""application\/vnd.openxmlformats-officedocument.presentationml.template"",""potm"":""application\/vnd.ms-powerpoint.template.macroEnabled.12"",""ppam"":""application\/vnd.ms-powerpoint.addin.macroEnabled.12"",""sldx"":""application\/vnd.openxmlformats-officedocument.presentationml.slide"",""sldm"":""application\/vnd.ms-powerpoint.slide.macroEnabled.12"",""onetoc|onetoc2|onetmp|onepkg"":""application\/onenote"",""oxps"":""application\/oxps"",""xps"":""application\/vnd.ms-xpsdocument"",""odt"":""application\/vnd.oasis.opendocument.text"",""odp"":""application\/vnd.oasis.opendocument.presentation"",""ods"":""application\/vnd.oasis.opendocument.spreadsheet"",""odg"":""application\/vnd.oasis.opendocument.graphics"",""odc"":""application\/vnd.oasis.opendocument.chart"",""odb"":""application\/vnd.oasis.opendocument.database"",""odf"":""application\/vnd.oasis.opendocument.formula"",""wp|wpd"":""application\/wordperfect"",""key"":""application\/vnd.apple.keynote"",""numbers"":""application\/vnd.apple.numbers"",""pages"":""application\/vnd.apple.pages""},""toolbars"":{""full"":{""1"":""formatselect,bold,italic,bullist,numlist,blockquote,alignleft,aligncenter,alignright,link,wp_more,spellchecker,fullscreen,wp_adv"",""2"":""strikethrough,hr,forecolor,pastetext,removeformat,charmap,outdent,indent,undo,redo,wp_help"",""3"":"",""4"":""},""basic"":{""1"":""bold,italic,underline,blockquote,strikethrough,bullist,numlist,alignleft,aligncenter,alignright,undo,redo,link,fullscreen""}},""admin_url"":""https:\/\/wptest.photoclub-reutlingen.de\/wp-admin\/"",""ajaxurl"":""https:\/\/wptest.photoclub-reutlingen.de\/wp-admin\/admin-ajax.php"",""nonce"":""6f1ca57d8e"",""acf_version"":""5.10.1"",""wp_version"":""5.8.1"",""browser"":""chrome"",""locale"":""de_DE"",""rtl"":false,""screen"":null,""post_id"":null,""validation"":null,""editor"":""classic""}; "; Match m = Regex.Match(input, pattern); Console.WriteLine("'{0}' found at index {1}", m.Value, m.Index); } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx