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

re = /"(?:[Aa]uthor[s]?|[Jj]ournalist|[Pp]erson)":(?:{(?:[^}[]+)?"name[s]?":\[?(?:"name":)?"|")([^"\\]+)/m str = '"author":"Lucy Bode","publisher":{"name":"Channel Void" "author":{"name":"Lucy Bode"},"publisher":{"name":"Channel Void" "author":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "author":{"names":["name":"Lucy Bode"]},"publisher":{"name":"Channel Void" "author":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "journalist":"Lucy Bode","publisher":{"name":"Channel Void" "journalist":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "journalist":{"names":["name":"Lucy Bode"]},"publisher":{"name":"Channel Void" "journalist":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "authors":"Lucy Bode","publisher":{"name":"Channel Void" "authors":{"name":"Lucy Bode"},"publisher":{"name":"Channel Void" "authors":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "authors":{"names":["name":"Lucy Bode"]},"publisher":{"name":"Channel Void" "authors":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "person":{"name":"Lucy Bode"},"publisher":{"name":"Channel Void" "person":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "person":{"names":["name":"Lucy Bode"]},"publisher":{"name":"Channel Void" "person":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "Person":{"name":"Lucy Bode"},"publisher":{"name":"Channel Void" "Person":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "Person":{"names":["name":"Lucy Bode"]},"publisher":{"name":"Channel Void" "Person":{"names":["Lucy Bode"]},"publisher":{"name":"Channel Void" "author":{"@type":"Person","name":"Lucy Bode"} "image":{"@type":"ImageObject","url":"https://static.nationalgeographic.co.uk/files/styles/image_3200/public/rewilding-redonda.jpg?w=1900&h=1267","width":1900,"height":1267,"author":{"@type":"Person","name":"Ed Marshall, Redonda Restoration Programme"},' # Print the match result str.scan(re) do |match| puts match.to_s end

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 Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html