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

/
/
gm

Test String

Substitution

Processing...

Code Generator

Generated Code

#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox Local $sRegex = "(?m)(\s*)(.*),?\n" Local $sString = "MERGE" & @CRLF & _ " market-data-351917.cobi_live_analytics.staging_blackrock_benchmark_security AS TARGET" & @CRLF & _ "USING" & @CRLF & _ " (" & @CRLF & _ " SELECT" & @CRLF & _ " security_id," & @CRLF & _ " effective_begin_timestamp," & @CRLF & _ " etl_job_id," & @CRLF & _ " record_digest," & @CRLF & _ " benchmark_source_name," & @CRLF & _ " corporate_benchmark_flag," & @CRLF & _ " corporate_benchmark_weight," & @CRLF & _ " investment_grade_flag," & @CRLF & _ " high_yield_flag" & @CRLF & _ " FROM" & @CRLF & _ " market-data-351917.cobi_live_analytics.security_corporate_benchmark_attributes AS a" & @CRLF & _ " LEFT JOIN (" & @CRLF & _ " SELECT" & @CRLF & _ " security_id," & @CRLF & _ " corporate_benchmark_effective_begin_timestamp," & @CRLF & _ " corporate_benchmark_record_digest" & @CRLF & _ " FROM" & @CRLF & _ " market-data-351917.cobi_live_analytics.security_current) AS b" & @CRLF & _ " USING" & @CRLF & _ " (security_id)" & @CRLF & _ " WHERE" & @CRLF & _ " a.corporate_benchmark_flag = TRUE" & @CRLF & _ " AND a.effective_begin_timestamp = b.corporate_benchmark_effective_begin_timestamp" & @CRLF & _ " AND a.benchmark_source_name = 'us_corporate_bond_ucits_etf') AS SOURCE" & @CRLF & _ "ON" & @CRLF & _ " target.security_id = source.security_id" & @CRLF & _ " WHEN NOT MATCHED" & @CRLF & _ " THEN" & @CRLF & _ "INSERT" & @CRLF & _ " (security_id," & @CRLF & _ " effective_begin_timestamp," & @CRLF & _ " etl_job_id," & @CRLF & _ " corporate_benchmark_record_digest," & @CRLF & _ " benchmark_source_name," & @CRLF & _ " corporate_benchmark_flag," & @CRLF & _ " corporate_benchmark_weight," & @CRLF & _ " investment_grade_flag," & @CRLF & _ " high_yield_flag)" & @CRLF & _ "VALUES" & @CRLF & _ " (source.security_id, source.effective_begin_timestamp, source.etl_job_id, source.record_digest, source.benchmark_source_name, FALSE, source.corporate_benchmark_weight, source.investment_grade_flag, source.high_yield_flag)" & @CRLF & _ "" Local $sSubst = "$1"$2 "\\\n" Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst) MsgBox($MB_SYSTEMMODAL, "Result", $sResult)

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 AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm