Regular Expressions 101

Save & Share

  • Regex Version: ver. 3
  • 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

r"
"
gm

Test String

Code Generator

Generated Code

#include <StringConstants.au3> ; to declare the Constants of StringRegExp #include <Array.au3> ; UDF needed for _ArrayDisplay and _ArrayConcatenate Local $sRegex = "(?m)(?sm)^\d\d?[.] {3,7}(.*?)(?=\n\n\d\d?\. |\Z)" Local $sString = "INTERNATIONAL MONETARY FUND 7" & @CRLF & _ " BELGIUM" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "POLICY DISCUSSIONS—MAINTAINING THE REFORM" & @CRLF & _ "MOMENTUM" & @CRLF & _ "7. The current recovery is an opportunity to strengthen the resilience and growth" & @CRLF & _ "potential of the Belgian economy. The government's ability to deal with future shocks will depend" & @CRLF & _ "on whether it implements the right policies now while the economy continues to recover." & @CRLF & _ "" & @CRLF & _ " First, with public debt above 100 percent of GDP and only starting to come down, Belgium still" & @CRLF & _ " has a long way to go to rebuild buffers and achieve a more sustainable fiscal position. This will" & @CRLF & _ " require following through on plans to gradually move toward structural balance." & @CRLF & _ "" & @CRLF & _ " Second, with real GDP growth projected at only around 1½ percent for the foreseeable future," & @CRLF & _ " further labor and product market reforms are needed to increase productivity growth, raise" & @CRLF & _ " potential output, and integrate vulnerable groups into the labor market." & @CRLF & _ "" & @CRLF & _ " Third, although the financial sector has recovered since the crisis and is generally sound, cyclical" & @CRLF & _ " vulnerabilities are rising and new challenges are emerging, suggesting the need for vigilance" & @CRLF & _ " and proactive policies.3" & @CRLF & _ "" & @CRLF & _ "8. The government agreed last summer on a new package of measures related to" & @CRLF & _ "taxation, the labor market, and social benefits (Table 2 and Box 1). The most notable reform was" & @CRLF & _ "a reduction in Belgium's corporate income tax (CIT) rate from 34 percent to 25 percent, to be" & @CRLF & _ "phased in over the next three years (SMEs will benefit from a reduced rate of 20 percent starting in" & @CRLF & _ "2018). To compensate for the resulting revenue loss, the notional interest rate deduction (NID) was" & @CRLF & _ "modified to apply only to incremental corporate equity rather than to the total stock, and new anti-" & @CRLF & _ "tax avoidance measures were introduced consistent with Belgium's EU obligations.4 Together, the" & @CRLF & _ "measures are designed to enhance Belgium's competitiveness while preserving revenue neutrality." & @CRLF & _ "" & @CRLF & _ "9. Policy discussions focused on the importance of maintaining the reform momentum" & @CRLF & _ "and not yielding to complacency. Achieving the balanced budget goal will require efforts at all" & @CRLF & _ "levels of government to make spending more efficient and safeguard revenues (Section A)." & @CRLF & _ "A combination of policies and reforms could help raise productivity growth, including increasing" & @CRLF & _ "investment in infrastructure and enhancing competition in services (Section B). To fully realize" & @CRLF & _ "Belgium's employment potential, it will be critical to address the severe fragmentation of the labor" & @CRLF & _ "market (Section C). To preserve financial stability, the authorities should address vulnerabilities in the" & @CRLF & _ "mortgage market and carefully navigate the transition toward a European Banking Union (Section D)." & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "3" & @CRLF & _ " A comprehensive assessment of Belgium's financial sector took place in 2017 under the Financial Sector" & @CRLF & _ "Assessment Program (FSAP)." & @CRLF & _ "4" & @CRLF & _ " The NID aims to neutralize the CIT treatment of debt and equity by supplementing the deductibility of interest with" & @CRLF & _ "a deduction that is the product of corporate equity and a notional interest rate." & @CRLF & _ "" & @CRLF & _ "" & @CRLF & _ "8" Local $aArray = StringRegExp($sString, $sRegex, $STR_REGEXPARRAYGLOBALFULLMATCH) Local $aFullArray[0] For $i = 0 To UBound($aArray) -1 _ArrayConcatenate($aFullArray, $aArray[$i]) Next $aArray = $aFullArray ; Present the entire match result _ArrayDisplay($aArray, "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 AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm