Regular Expressions 101

Save & Share

  • Regex Version: ver. 5
  • 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

/
/

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`\(category[^ ]*\)`) var str = []byte(`<CRIT> 23-Jun-2014::10:57:13.649 Upgrade committed <CRIT> 23-Jun-2014::10:57:13.703 no registration found for callpoint plmsView/get_next of type=external <CRIT> 23-Jun-2014::10:57:13.703 no registration found for callpoint View/get_next of type=external http://yxuy5oau7nugw4kpb4lclrqdbixp3wvc4iuiad23ebyp2q3gx7rtrgqd.onion/items/crystal-meth-10g-mdma/refunds-policy http://yxuy5oau7nugw4kpb4lclrqdbixp3wvc4iuiad23ebyp2q3gx7rtrgqd.onion/items/category/tutorials-and-e-books`) var substitution = []byte("") var count = 1 // negative counter is equivalent to global case (replace all) str = re.ReplaceAllStringFunc(str, func(s string) string { if count == 0 { return s } count -= 1 return re.ReplaceAllString(s, substitution) }) fmt.Println(string(str)) }

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 Golang, please visit: https://golang.org/pkg/regexp/