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

/
/
gm

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 = "^\\\"\\w+\\\"\\,(?:\\\")?(?<process>([\\w|\\s|\\,|\\.|\\-|\\+]+)?)(?:\\\")?\\,\\\"(?<handles>\\d+)\\\"\\,\\\"(?<VM>[\\-\\d|\\d]+)\\\"\\,\\\"(?<WS>\\d+)\\\"\\,\\\"(?<PM>\\d+)\\\"\\,\\\"(?<NPM>\\d+)\\\"\\,(?:\\\")?(?<Path>([a-zA-Z]\\:\\\\[\\\\\\w\\s\\.\\-\\(\\)\\+|*\\w]+)?)(?:\\\")?\\,(?:\\\")?(?<Company>([\\w|\\s|\\,|\\.|\\@]+)?)(?:\\\")?\\,(?:\\\")?(?<CPU>[\\d|\\.]+)?(?:\\\")?\\,(?:\\\")?(?<FileVersion>[\\d|\\.|\\s|\\(|\\w|\\_|\\-|\\)]+)?(?:\\\")?\\,(?:\\\")?(?<ProductVersion>[\\d|\\.|\\s|\\(|\\w|\\_|\\-|\\)]+)?(?:\\\")?\\,(?:\\\")?(?<Description>[\\d|\\.|\\s|\\(|\\w|\\_|\\-|\\|\\+|\\:)]+)?(?:\\\")?\\,(?:\\\")?(?<Product>[\\w|\\s|\\®|\\+|\\(|\\)]+)?(?:\\\")?\\,(?:\\\")?(?<Id>[\\w|\\s|\\®|\\+|\\(|\\)]+)?(?:\\\")?\\,(?:\\\")?(?<PriorityClass>[\\w|\\s|\\®|\\+|\\(|\\)]+)?(?:\\\")?\\,(?:\\\")?(?<HandleCount>[\\w|\\s|\\®|\\+|\\(|\\)]+)?(?:\\\")?\\,"; final String string = "\"Process\",\"ServerManager\",\"509\",\"830853120\",\"149446656\",\"125960192\",\"31992\",\"C:\\Windows\\system32\\ServerManager.exe\",\"Microsoft Corporation\",\"140.25\",\"6.3.9600.17238 (winblue_gdr.140723-2018)\",\"6.3.9600.17238\",\"Server Manager\",\"Microsoft® Windows® Operating System\",\"18324\",\"Normal\",\"509\",\"149446656\",\"125960192\",\"125960192\",\"830853120\",\"00:02:20.2500000\",\"8\",,\"False\",,\"2200\",\"Microsoft.Win32.SafeHandles.SafeProcessHandle\",\".\",\"65976\",\"Server Manager\",\"System.Diagnostics.ProcessModule (ServerManager.exe)\",\"1413120\",\"204800\",\"System.Diagnostics.ProcessModuleCollection\",\"31992\",\"31992\",\"125960192\",\"741880\",\"741880\",\"256077824\",\"256077824\",\"279134208\",\"279134208\",\"885768192\",\"885768192\",\"True\",\"125960192\",\"00:00:27.8125000\",\"ServerManager\",\"255\",\"True\",\"1\",\"System.Diagnostics.ProcessStartInfo\",\"1/26/2020 3:22:29 PM\",,\"System.Diagnostics.ProcessThreadCollection\",\"00:01:52.4375000\",\"830853120\",\"False\",,,,\"149446656\",,"; final Pattern pattern = Pattern.compile(regex, 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