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)([^EAN]*$)*\d{3}\d{4,6}\d{3,5}\d`) var str = `EAN\n\n0889842596601\n\nUtilização\n\nMobilidade\n\nProcessador\n\nIntel® Core™ m3-8100Y Dual Core\n\nFrequência\n\n1,1 GHz\n\nCache Processador\n\n4 MB\n\nMemória RAM\n\n8 GB\n\nTipo Memória\n\nLPDDR3\n\nPlaca(s) Gráfica(s)\n\nIntel HD Graphics\n\nDisco SSD\n\n128 GB\n\nDimensão Ecrã\n\n10,51 ''\n\nTipo de Ecrã\n\nEcrã tátil PixelSense com resolução 1920 x 1280\n\nSistema Áudio\n\nAltifalantes estéreo 2W\n\nLeitor de Cartões\n\nLeitor de cartões microSD\n\nInterfaces\n\n1x USB-CSurface Connect™Jack 3,5mm\n\nCâmara\n\nCâmara frontal de 5 MP com 1080pCâmara posterior de 8 MP com 1080p\n\nComunicações\n\nWi-Fi 6 802.11axBluetooth 5.0LTE com suporte nanoSIM e eSIM\n\nSistema Operativo\n\nWindows 10 Home em modo S (64-bit)\n\nBateria\n\nLi-ion\n\nAutonomia (estimativa)\n\nAté 9,5 horas\n\nOutras Funcionalidades\n\nAcelerômetroMagnetômetroGiroscópioSensor de luz ambiente\n\nDimensões\n\n24,5 x 17,5 x 0,83 cm\n\nPeso\n\n0,54 Kg\n\nAcessórios\n\nFonte de alimentação\n\nOutros\n\nCapa teclado vendida separadamente\n\nMenção Legal\n\nTenha em atenção o país de expedição do vendedor, pois o ` 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/