Regular Expressions 101

Save & Share

  • Regex Version: ver. 4
  • 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

/
/
i

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?i)<img(?:[\s\w="]+)src="([^"]+)"(?:[\s\w="]*)\/?>`) var str = `<img src="image1.jpg" width="200" height="200"> <div>\r\n<h2 class=\"ng-binding\" style=\"text-align: center;\"><span style=\"color: #ff0000;\">قيولي50 درصدي دانش آموزان در آزمون تيزهوشان</span></h2>\r\n</div>\r\n<div class=\"ng-scope\" style=\"text-align: center;\">\r\n<div class=\"groupsRowSeperator\">&nbsp;</div>\r\n<div id=\"contextData\">\r\n<h3 class=\"ng-scope\"><span style=\"color: #008000;\">افتخار آفريني تيزهوشاني&nbsp;</span></h3>\r\n<h3 class=\"ng-scope\"><span style=\"color: #800080;\">قبولي50 درصدي دانش آموزان دبستان هوشمند شهيد مهدوي&nbsp;در آزمون تيزهوشان&nbsp;سال تحصيلي&nbsp;99-98&nbsp;برگ زرين ديگري براي شما اولياي گرامي و همكاران محترم و نتيجه اطميناني بود كه به هم داشتيم.</span></h3>\r\n<h3 class=\"ng-scope\"><span style=\"color: #800080;\">اين موفقيت بزرگ را به كليه دانش آموزان عزيز ، والدين گرامي ، معلمين دلسوز ، همكاران پرتلاش دبستان هوشمند شهيد مهدوي تبريك و تهنيت عرض مي نمائيم.</span></h3>\r\n<p class=\"ng-scope\">&nbsp;</p>\r\n<p class=\"ng-scope\"><img src=\"http://mahdavi-smart-school.ir/upload/5/akhbar/97-98/IMG-20190805-WA0014.jpg\" alt=\"\" width=\"423\" height=\"1060\" /></p>\r\n</div>\r\n</div>\r\n<div class=\"CommentBox\" style=\"text-align: center;\">&nbsp;</div>` if len(re.FindStringIndex(str)) > 0 { fmt.Println(re.FindString(str),"found at index",re.FindStringIndex(str)[0]) } }

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/