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

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)(👨)(?:([🏻🏼🏽🏾🏿])?(\x{200D}[🦰🦱🦳🦲])?\x{FE0F}?)?`) var str = `Codepoints 👨 U+1F468 Shortcodes :man: Related 👨 Man 👨🏻 Man: Light Skin Tone 👨🏼 Man: Medium-Light Skin Tone 👨🏽 Man: Medium Skin Tone 👨🏾 Man: Medium-Dark Skin Tone 👨🏿 Man: Dark Skin Tone 👩 Woman 👩🏻 Woman: Light Skin Tone 👩🏼 Woman: Medium-Light Skin Tone 👩🏽 Woman: Medium Skin Tone 👩🏾 Woman: Medium-Dark Skin Tone 👩🏿 Woman: Dark Skin Tone See also 🧔 Man: Beard 🧔🏻 Man: Light Skin Tone, Beard 🧔🏼 Man: Medium-Light Skin Tone, Beard 🧔🏽 Man: Medium Skin Tone, Beard 🧔🏾 Man: Medium-Dark Skin Tone, Beard 🧔🏿 Man: Dark Skin Tone, Beard 👨‍🦳 Man: White Hair 👨🏻‍🦳 Man: Light Skin Tone, White Hair 👨🏼‍🦳 Man: Medium-Light Skin Tone, White Hair 👨🏽‍🦳 Man: Medium Skin Tone, White Hair 👨🏾‍🦳 Man: Medium-Dark Skin Tone, White Hair 👨🏿‍🦳 Man: Dark Skin Tone, White Hair 👩‍🦳 Woman: White Hair 👩🏻‍🦳 Woman: Light Skin Tone, White Hair 👩🏼‍🦳 Woman: Medium-Light Skin Tone, White Hair 👩🏽‍🦳 Woman: Medium Skin Tone, White Hair 👩🏾‍🦳 Woman: Medium-Dark Skin Tone, White Hair 👩🏿‍🦳 Woman: Dark Skin Tone, White Hair 👨‍🦰 Man: Red Hair 👨🏻‍🦰 Man: Light Skin Tone, Red Hair 👨🏼‍🦰 Man: Medium-Light Skin Tone, Red Hair 👨🏽‍🦰 Man: Medium Skin Tone, Red Hair 👨🏾‍🦰 Man: Medium-Dark Skin Tone, Red Hair 👨🏿‍🦰 Man: Dark Skin Tone, Red Hair 👩‍🦰 Woman: Red Hair 👩🏻‍🦰 Woman: Light Skin Tone, Red Hair 👩🏼‍🦰 Woman: Medium-Light Skin Tone, Red Hair 👩🏽‍🦰 Woman: Medium Skin Tone, Red Hair 👩🏾‍🦰 Woman: Medium-Dark Skin Tone, Red Hair 👩🏿‍🦰 Woman: Dark Skin Tone, Red Hair 👦 Boy ♂ Male Sign 🕺 Man Dancing 👲 Man With Chinese Cap 🕴 Man in Suit Levitating 🤵 Man in Tuxedo 👴 Old Man 👵 Old Woman 🎅 Santa Claus` 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/