Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • 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

/
/
g

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 = "(?:Expiration Fee: )?(\\d+)\\s+((?:[a-zA-Z\\d\\/]+\\s+)*)(?:\\(([a-zA-Z]+)\\)\\s+)?(?:>([0-9.]+)\\s+)?(?:([\\d.]+-[\\d.]+)\\s*)?(?:\\((\\d{1,2}(?::\\d{2})?[AP]M)\\)\\s+)?(?:@\\s+([\\d.]+))?"; final String string = "Expiration Fee: 10 LONG AUD/USD >.8189 (9:50AM) @ 90.5\n" + "10 Wall St 30 (Mar) >17900 (4:15PM) @ 69.5\n" + "2 AUD/USD >.8114 (11:35AM) @ 97.5\n" + "Expiration Fee: 1 SHORT AUD/USD >.8114 (11:35AM) @ 87\n" + "2 Wall St 30 (Mar) 18000-18100 (12PM) @ 18023\n" + "2 LONG US Tech 100 (Mar) >4284 (1:15PM) @ 56.5\n" + "1 EUR/USD >1.2180 (3PM) @ 41.5\n" + "Expiration Fee: 1 SHORT AUD/USD >.8114 (11:35AM) @ 87\n" + "Expiration Fee: 1 LONG GBP/USD >1.5090 (8:55PM) @ 95.5\n" + "Expiration Fee: 2 SHORT US 500 (Mar) >2037.7 (10AM) @ 5.5\n" + "Expiration Fee: 1 SHORT EUR/USD >1.1582 (2:20PM) @ 11.5\n" + "6 SHORT GBP/USD >1.5200 (3:10PM) @ 22.3333\n" + "Expiration Fee: 1 SHORT GBP/USD >1.5085 (8PM) @ 17.5\n" + "Expiration Fee: 1 SHORT EUR/GBP >.7340 (3PM) @ 33.25\n" + "2 Wall St 30 (Mar) 18000-18100 (12PM) @ 18023\n" + "Expiration Fee: 5 LONG US Tech 100 (Mar) 4190-4390 (4:15PM) @ 4291\n" + "2 LONG Wall St 30 (Mar) >18000 (1:15PM) @ 53.5\n" + "1 AUD/USD .7570-.7670 (2PM) @ 0.7626\n" + "1 US 500 (Jun) 2075.0-2085.0\n" + "1 US 500 (Jun) 2075.0-2085.0 (1PM) @ 2079\n" + "1 AUD/USD .7570-.7670 (2PM) @ 0.7626\n" + "2 AUD/USD .8020-.8220 (11PM) @ 0.8118"; final Pattern pattern = Pattern.compile(regex); 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