Regular Expressions 101

Save & Manage Regex

  • Current Version: 2
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(.*:[\w]{2} )(.*)`) var str = `drwxr-xr-x 0 0 2017-04-01 09:15 app drwxr-xr-x 0 2000 2017-03-30 20:53 bin -rw-r--r-- 0 0 10911 2017-04-11 18:53 build.prop drwxr-xr-x 0 0 2017-04-01 09:14 data-app drwxr-xr-x 0 0 2017-06-05 22:01 etc drwxr-xr-x 0 0 2017-03-30 20:53 fonts drwxr-xr-x 0 0 2017-04-17 20:39 framework drwxr-xr-x 0 0 2017-03-30 20:53 lib drwxr-xr-x 0 0 2017-03-30 20:53 lib64 drwxrwx--- 0 0 2017-03-30 20:52 lost+found drwxr-xr-x 0 0 2017-03-31 05:58 media drwxr-xr-x 0 0 2017-04-01 09:16 priv-app drwxr-xr-x 0 0 2017-03-30 20:54 rfs drwxr-xr-x 0 0 2017-03-30 20:54 spaces drwxr-xr-x 0 0 2017-03-30 20:54 usr drwxr-xr-x 0 2000 2017-03-30 20:54 vendor drwxr-xr-x 0 2000 2017-03-30 20:54 xbin` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", 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 Golang, please visit: https://golang.org/pkg/regexp/