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

Substitution

Processing...

Code Generator

Language

Generated Code

re = /(?<prod_no>[\w.]*)µ&£(?<prod_label>[^µ&£]*)µ&£(?<prod_category>[^µ&£]*)µ&£(?<cnk>[^µ&£]*)µ&£(?<pzn>[^µ&£]*)µ&£(?<cip>[^µ&£]*)µ&£(?<ean>[^µ&£]*)µ&£(?<cefip>[^µ&£]*)µ&£(?<country>[^µ&£]*)µ&£$/m str = 'F0002051µ&£ABIES NIGRA BOIR GRAN 4CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ B000614172µ&£FADE OUT POT 60MLµ&£µ&£µ&£µ&£µ&£µ&£µ&£Bµ&£ F0011050µ&£ACONITUM NAPEL GRAN 4CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F0011073µ&£ACONITUM NAPEL GRAN 5CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F0011096µ&£ACONITUM NAPEL GRAN 7CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F0011104µ&£ACONITUM NAPEL GRAN 9CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F0011127µ&£ACONITUM NAPEL GRAN 15CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F0011133µ&£ACONITUM NAPEL GRAN 30CH 80µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F0011162µ&£ACONITUM NAPEL GLOB 7CH 1 DOSEµ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F4459818µ&£B/VARISMA1 SEDUCT AF C CANEL á1µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F4459824µ&£B/VARISMA1 SEDUCT AF N CANEL 1µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F4459830µ&£B/VARISMA1 SEDUCT AF C CANEL 2µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F4459847µ&£B/VARISMA1 SEDUCT AF N CANEL 2µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F4459853µ&£B/VARISMA1 SEDUCT AF C CANEL 3µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ F4459876µ&£B/VARISMA1 SEDUCT AF N CANEL 3µ&£µ&£µ&£µ&£µ&£µ&£µ&£Fµ&£ ' subst = '$2µ&£$3µ&£$4µ&£$5µ&£$6µ&£$7µ&£$8µ&£$9µ&£\\\\N' result = str.gsub(re, subst) # Print the result of the substitution puts result

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