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

/
/
gm

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)Hashim Palliveedu <Hashim.Palliveedu@ltimindtree.com>; Pramod Mogarkar <Pramod.Mogarkar@ltimindtree.com>; Rashmi Agarwal <Rashmi.Agarwal@ltimindtree.com>; Sundarrajan Ganesan <Sundarrajan.Ganesan@ltimindtree.com>; Ganesh Baskar <Ganesh.Baskar@ltimindtree.com>; Rajendra Athalye <Rajendra.Athalye@ltimindtree.com>; Kaustav Banerjee <Kaustav.Banerjee@ltimindtree.com>; Nagesh G N <Nagesh.GN@ltimindtree.com>; Mumtaz Alam <Mumtaz.Alam@ltimindtree.com>; SapanA Shah <SapanA.Shah@ltimindtree.com>; Rajendra Athalye <Rajendra.Athalye@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; R Vijaykumar <R.Vijaykumar@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Rohan Thombre <Rohan.Thombre@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Shraddha1 Sinha <Shraddha1.Sinha@ltimindtree.com>; Rajendra Athalye <Rajendra.Athalye@ltimindtree.com>; Vamsi Krishna <Vamsi.Krishna@ltimindtree.com>; Ranajoy Ghosh <Ranajoy.Ghosh@ltimindtree.com>; Ranajoy Ghosh <Ranajoy.Ghosh@ltimindtree.com>; Ranajoy Ghosh <Ranajoy.Ghosh@ltimindtree.com>; Lata Kademani <Lata.Kademani@ltimindtree.com>; Mukesh Kumar Saini <Mukesh.Saini@ltimindtree.com>; Mukesh Kumar Saini <Mukesh.Saini@ltimindtree.com>; Santosh Umesh Malimath <Santosh.Malimath@ltimindtree.com>; Salona Pal <Salona.Pal@ltimindtree.com>; Salona Pal <Salona.Pal@ltimindtree.com>; Salona Pal <Salona.Pal@ltimindtree.com>; R Vijaykumar <R.Vijaykumar@ltimindtree.com>; R Vijaykumar <R.Vijaykumar@ltimindtree.com>; Gokula Krishnan <Gokula.Krishnan@ltimindtree.com>; Amit Garg <Amit.Garg1@ltimindtree.com>; Swapnali Garge <Swapnali.Garge@ltimindtree.com>; Pradeep Pillai <Pradeep.Pillai@ltimindtree.com>; Amit Thuse <Amit.Thuse@ltimindtree.com>; Ravi Kumar Venkatappa <Ravi.KumarVenkatappa@ltimindtree.com>; Mahalakshmi Veerabadran <Mahalakshmi.Veerabadran@ltimindtree.com>; Sourav Sen <sourav.sen1@ltimindtree.com>; Rajat Rath <Rajat.Rath@ltimindtree.com>; Rajat Rath <Rajat.Rath@ltimindtree.com>; Anusha Rnair <Anusha.Nair@ltimindtree.com>; Rohit Jain <Rohit.Jain2@ltimindtree.com>; Swapna Sugumar <Swapna.Sugumar@ltimindtree.com>; Swapna Sugumar <Swapna.Sugumar@ltimindtree.com>; Jyotish Talukdar <Jyotish.Talukdar@ltimindtree.com>; Jyotish Talukdar <Jyotish.Talukdar@ltimindtree.com>; Sudeepta Ray <Sudeepta.Ray@ltimindtree.com>; Nisanth Mohanadasan <Nisanth.Mohanadasan@ltimindtree.com>; Nisanth Mohanadasan <Nisanth.Mohanadasan@ltimindtree.com>; Abhideep Chakravarty <Abhideep.Chakravarty@ltimindtree.com>; Nisanth Mohanadasan <Nisanth.Mohanadasan@ltimindtree.com>; Sangram Panda <Sangram.Panda2@ltimindtree.com>; Shirish Jaiswal <Shirish.Jaiswal@ltimindtree.com>; Sandip Motwani <Sandip.Motwani@ltimindtree.com>; Tirtha Ghosh <Tirtha.Ghosh@ltimindtree.com>; Uday Shankar <Uday.Shankar@ltimindtree.com>; Nabyendu Roy <Nabyendu.Roy@ltimindtree.com>; Tirtha Ghosh <Tirtha.Ghosh@ltimindtree.com>; Maneesh Singhal <Maneesh.Singhal@ltimindtree.com>; Vinay Padegaonkar <Vinay.Padegaonkar@ltimindtree.com>`) var str = `Requester letitia.partridge@bayleys.co.nz To view the completed version, please see the file attached.` 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/