Regular Expressions 101

Save & Share

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

/
/
img

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "^(?!\\d\\d?[ex]\\d\\d?)(?:\\[(?:[-\\w\\s]+)*\\] )?(.*?)[-_. ]?(?:[\\{\\(\\[]?(?:dvdrip|[-._\\b]ita|[-._\\b]eng|xvid| cd\\d|dvdscr|\\w{1,5}rip|divx|\\d+p|\\d{4}).*?)?\\.([\\w]{2,3})$"; final String string = "22. Non Puoi Sempre Dire Quello Kent Ti Pare.avi\n" + "6x13 - Una festa spettacolare.mkv\n" + "After earth.avi\n" + "Capitan America Il Primo Vendicatore 480p.mkv\n" + "Dylan Dog 2010 Ac3.avi\n" + "FUMETTOLOGY - 11 - PUNTATA SPECIALE.by.IperB.mkv\n" + "Guida galattica per autostoppisti [BDrip 720p ITA-ENG sub ITA-ENG].mkv\n" + "Hook - Capitan Uncino (1991).avi\n" + "Kick Ass 2.avi\n" + "Lemony Snicket - Una serie di sfortunati eventi 2004.avi\n" + "Monty Python e il Sacro Graal.avi\n" + "Pacific_Rim_2004_BdRip_1080p_ITA_ENG_ANONIMO_CREW.mkv\n" + "Pompeii.2014.iTALiAN.DTS.Dual.1080p.BluRay.x264-TRtD_TeaM.mkv\n" + "Ralph Spaccatutto.avi\n" + "Red Hot Chili Simpson.avi\n" + "RobinHood-UnUomoInCalzamaglia.ENG.srt\n" + "The.Lego.Movie.2014.iTALiAN.AC3.DUAL.1080p.BluRay.x264-TrTd_TeaM.mkv\n" + "The.Pagemaster.1994.1080p.BluRyMux.by.gemini9669.mkv\n" + "Tom.&.Jerry.Avventure.Giganti.Giant.Adventure.2013.DVDRip.ITA.AC3.ENG.Mp3-MLN.avi\n" + "Tron 480p.mkv\n" + "Viaggi Spazio - Temporali.avi\n" + "Vite Aliene.avi\n" + "[DivX - ITA] The Simpson - Natale con i Simpsons 2003.avi\n" + "[SUB ITA] Monty Python e il Sacro Graal.srt\n" + "[Sub ENG] Monty Python e il Sacro Graal.srt\n" + "codeschool_1322.mp4\n" + "corto.avi\n" + "film xvid.ENG.srt\n" + "[rec].mp4\n" + "recita.mp4\n" + "regeng.flv"; final Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE | Pattern.MULTILINE); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html