Regular Expressions 101

Save & Share

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)((\*|((((count|max|sum|min|avg|version|database|user|round|ceil|floor|truncate|mod)\((\*|\w+|\s*)\)\s?,?\s?)|(\w+(.\w+\s+,\s+))){1,}));?)`) var str = `table4.id , table5.name , table6.name , table7.name , table8.name , table9.name , ddd ((\s?\w+(\.\w+)?\s?\,\s?)*) select count(*) , max(table4.id) from table4,table5 left join tab2 on tab1.size = tab2.size , right join tab2 on tab1.size = tab2.size where id <> 1 having dd group by dd order by dd desc dd - 2 > 3; select user(); select * from user where id = (select * from dd where id = 1); select count(vdvdvdvfd) from table4,table5 where table4.id=table5.id; select tt.dd from table4,table5 where table4.id=table5.id; count(vdvdvdvfd) , max(fdvd) , sum(fdvd) , min(fdvd) , avg(fdvd) , version() , table , count(ff) , table ((\*|((((count|max|sum|min|avg|version|database|user|round|ceil|floor|truncate|mod)\((\*|\w+|\s*)\)\s?,?\s?)|(\w+(.\w+\s+,\s+))){1,}));?) ((((count|max|sum|min|avg|version|database|user)\((\*|\w+|\s*)\)\s?,?\s?){1,});?) ((\*|(((count|max|sum|min|avg|version|database|user|round|ceil|floor|truncate|mod)\((\*|\w+|\s*)\)\s?,?\s?){1,}));?) select\s+(\*|((\w+(\.\w+)?)+(\s?,\s?\w+(\.\w+)?)*)|((\w+\([^\s]|(\w+\.\w+)?\))(\s+\,\s+)?)+)\s+from\s+(\w+(\s?,\s?\w+)*\;?)(\s+((\w+\s+join)\s+(\w+(\.\w)?\s+on\s+(\w+(\.\w+)?\s+=\s+\w+(\.\w+)?)?)(\s+,\s+)?)+)?(\s+((limit\s+(\w+)?\s?(\,\w+\;)?)|((where)?\s+?([^\;]+\s?;))))? select\s+(\*|((\w+(\.\w+)?)+(\s?,\s?\w+(\.\w+)?)*)|((\w+\([^\s]|(\w+\.\w+)?\))(\s+\,\s+)?)+)\s+from\s+(\w+(\s?,\s?\w+)*\;?)(\s+((\w+\s+join)\s+(\w+(\.\w)?\s+on\s+(\w+(\.\w+)?\s+=\s+\w+(\.\w+)?)?)(\s+,\s+)?)+)?(\s+((limit\s+(\w+)?\s?(\,\w+\;)?)|((where)?\s+?([^\;]+\s?;))))? select\s+((\*|(((count|max|sum|min|avg|version|database|user|round|ceil|floor|truncate|mod)\((\*|\w+|\s*)\)\s?,?\s?){1,}));?)\s+from\s+(\w+(\s?,\s?\w+)*\;?)(\s+((\w+\s+join)\s+(\w+(\.\w)?\s+on\s+(\w+(\.\w+)?\s+=\s+\w+(\.\w+)?)?)(\s+,\s+)?)+)?(\s+((limit\s+(\w+)?\s?(\,\w+\;)?)|((where)?\s+?([^\;]+\s?;))))? ` 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/