Regular Expressions 101

Save & Manage Regex

  • Current Version: 25
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
Sponsors
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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

import re regex = re.compile(r"(<Contract)(.*)(Contract>)", flags=re.IGNORECASE | re.DOTALL) test_str = ("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n" "<Records xmlns=\"http://www.datapump.cig.com\">\n" "<Contract phaseId=\"4\" operation=\"2\">\n" " <General>\n" " <ContractCode>8848</ContractCode>\n" " <DateOfSignature>2009-09-08</DateOfSignature>\n" " <CreditPurpose id=\"20\"/>\n" " <NegativeStatus id=\"4\"/>\n" " <ApplicationDate>2009-09-08</ApplicationDate>\n" " <StartDate>2009-09-08</StartDate>\n" " <ExpectedEndDate>2011-03-31</ExpectedEndDate>\n" " <Subjects>\n" " <Subject roleId=\"1\">\n" " <Entity>\n" " <Individual gender=\"1\">\n" " <FirstName>\n" "<Text language=\"uk-UA\">украинский</Text>\n" " </FirstName>\n" " <Surname>\n" "<Text language=\"uk-UA\">Первый</Text>\n" " </Surname>\n" " <FathersName>\n" "<Text language=\"uk-UA\">контрагент</Text>\n" " </FathersName>\n" " <Classification id=\"1\"/>\n" " <DateOfBirth>1980-12-06</DateOfBirth>\n" " <Residency id=\"1\"/>\n" " <Citizenship code=\"UA\"/>\n" " <MaritalStatus id=\"2\"/>\n" " <Identifications>\n" "<Identification typeId=\"2\">\n" "<Number>2554209876</Number>\n" "</Identification>\n" "<Identification typeId=\"4\">\n" "<Number>ВЦ620997</Number>\n" "<IssueDate>1997-04-01</IssueDate>\n" "<Authority language=\"uk-UA\">Дебальцевский ГОУМВД Украины в Донецкой области</Authority>\n" "</Identification>\n" "<Identification typeId=\"1\">\n" " <Number>2554209876</Number>\n" "</Identification>\n" " </Identifications>\n" " <Addresses>\n" "<Address typeId=\"2\">\n" "<Street>\n" " <Text language=\"uk-UA\">м. Kharkov, вул. Street, буд. 1, кв. 1</Text>\n" "</Street>\n" "</Address>\n" " </Addresses>\n" " </Individual>\n" " </Entity>\n" " </Subject>\n" " </Subjects>\n" " </General>\n" " <Type>\n" " <Credit paymentPeriodId=\"9\" paymentMethodId=\"6\">\n" " <CreditLimit currency=\"USD\">7800.0</CreditLimit>\n" " <Records>\n" " <Record accountingDate=\"2011-04-20\">\n" " <CreditUsage id=\"3\"/>\n" " <ResidualAmount currency=\"USD\">7800.0</ResidualAmount>\n" " <OverdueAmount currency=\"USD\">0.0</OverdueAmount>\n" " </Record>\n" " </Records>\n" " </Credit>\n" " </Type>\n" "</Contract>") subst = "" result = regex.sub(subst, test_str) if result: print(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 Python, please visit: https://docs.python.org/3/library/re.html