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

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/^(\d+)\s+(\d+)\s+\d+\s+\w+\s+\S+\s+(\S+)\s+(\S+)\s+(\S+\s\S+)\s(\S+\s\S+).*$/m'; $str = '1 100 1 REAL_REWARD ANNOUNCEMENT,NEED_CONTACT 80013:1 50001:90 2020-09-28 10:00:00 2020-09-29 03:59:59 胸针 80002 640 栗雄坐姿玩偶 0 2 100 1 REAL_REWARD ANNOUNCEMENT,NEED_CONTACT 80006:1 50001:460 2020-09-28 10:00:00 2020-09-29 03:59:59 毛毯披肩 80003 640 紫咪小鹰坐姿玩偶 0 3 100 1 REAL_REWARD ANNOUNCEMENT,NEED_CONTACT 80005:1 50001:640 2020-09-28 10:00:00 2020-09-29 03:59:59 嘟嘟河马坐姿玩偶 80004 640 爱逗蛙坐姿玩偶 0 '; $subst = " <packageMeta packageId=\"\1\" remark=\"\"> <sum>\2</sum> <limit>1</limit> <discount>1</discount> <type>REAL_REWARD</type> <showTypes class=\"java.util.ArrayList\"> <showType>ANNOUNCEMENT</showType> <showType>NEED_CONTACT</showType> </showTypes> <items>\3</items> <cost>\4</cost> <startTime>\5</startTime> <endTime>\6</endTime> <usingPlatform class=\"java.util.ArrayList\"> <string/> </usingPlatform> <excludePlatform class=\"java.util.ArrayList\"> <string/> </excludePlatform> <extra/> </packageMeta> "; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$result;

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 PHP, please visit: http://php.net/manual/en/ref.pcre.php