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

/
/
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 = "(?:.*?^0\\,){1}"; final String string = "\"REC01\",\n" + "\"Recipe1\",\n" + "10,\n" + "\"\",\n" + "\"\",\n" + "\" \",\n" + "2000,\n" + "\"0101\",\n" + "\" \",\n" + "\" \",\n" + "\"126\",\n" + "\"REC01\",\n" + "\" \",\n" + "0,\n" + "0,\n" + "5,\n" + "38.182,\"11200\",\"Ingredient1\",\" \",\" \",\"1\",\n" + "12.121,\"11800\",\"Ingredient2\",\" \",\" \",\"1\",\n" + "27.475,\"30910\",\"Ingredient3\",\" \",\" \",\"1\",\n" + "2.020,\"26200\",\"Ingredient4\",\" \",\" \",\"1\",\n" + "20.202,\"C01\",\"Ingredient5\",\" \",\" \",\"1\",\n" + "0,\n" + "\"REC02\",\n" + "\"Recipe2\",\n" + "10,\n" + "\"13/04/21\",\n" + "\"13/04/21\",\n" + "\" \",\n" + "1000,\n" + "\"0101\",\n" + "\" \",\n" + "\" \",\n" + "\"17\",\n" + "\"REC02\",\n" + "\" \",\n" + "0,\n" + "0,\n" + "3,\n" + "61.600,\"11200\",\"Ingredient1\",\" \",\" \",\"1\",\n" + "23.400,\"30910\",\"Ingredient3\",\" \",\" \",\"1\",\n" + "15.000,\"BR-F01\",\"Ingredient6\",\" \",\" \",\"1\",\n" + "0,\n" + "\"REC03\",\n" + "\"Recipe3\",\n" + "10,\n" + "\"19/03/21\",\n" + "\"19/03/21\",\n" + "\" \",\n" + "1000,\n" + "\"0103\",\n" + "\" \",\n" + "\" \",\n" + "\"28\",\n" + "\"REC03\",\n" + "\" \",\n" + "0,\n" + "0,\n" + "9,\n" + "64.450,\"11200\",\"Ingredient1\",\" \",\" \",\"1\",\n" + "12.700,\"30910\",\"Ingredient3\",\" \",\" \",\"1\",\n" + "2.000,\"20600\",\"Ingredient7\",\" \",\" \",\"1\",\n" + "12.000,\"27220\",\"Ingredient8\",\" \",\" \",\"1\",\n" + "0.320,\"584\",\"Ingredient9\",\" \",\" \",\"1\",\n" + "0.830,\"588\",\"Ingredient10\",\" \",\" \",\"1\",\n" + "0.050,\"599\",\"Ingredient11\",\" \",\" \",\"1\",\n" + "0.040,\"600\",\"Ingredient12\",\" \",\" \",\"1\",\n" + "7.610,\"585\",\"Ingredient13\",\" \",\" \",\"1\",\n" + "0,"; 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