Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • 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

Code Generator

Language

Generated Code

import re regex = re.compile(r"\/(?:\/|\/\s)razor:([^~]*?=)([^~]*?;)[^*]+?\/(?:\/|\s)endrazor") test_str = ("var exp = module.exports = {};\n\n" "var pageIsLoaded = true;\n" "//razor:var cttCipher = [@Raw(Model.CipherText)];\n" "var cttCipher = [\"U2FsdGVkX19f2rSF8G7sSSKwr+JWsEZYySfbePfitkbo462FKaIJNOc/v5V8+h\"\n" ",\"Vo4k5dHornELJHfTx2h+XsXQstYXFL13QdRFQ5v0OfWNIubrYlnQBm6DOdHKQlJ44j2RJLg2cknFDX0\"\n" ",\"bwBWvXCP2/db6HShj9/NtdusBUcGf62bnZC1ADeFxKnR+r6Sa8SNEk2AAlq8k6cN0z4EpL/WgQrGVNe\"\n" ",\"+nmAlLxxY1MexWZ0rWc5pjlubyddKK9Z+jbcbXqmseED1iXPHjcmGsPHrMQIylWmt2jXaw6bq/8IVrF\"\n" ",\"UgqZPL1ICfWF7bTy3SNkI+t6o/vEvq1GJ9iqvn7qQyPrqCL2ztuORPhPwMGP7ZzzVUozT+c7Wj1X2eU\"\n" ",\"qkgxjpECjmJiigXFHCv/vWC/Yk4+oK644ajGknDFvt7dQKb320uJHdfNuuFAZiVQ2DrSfxq+DIWe4pj\"\n" ",\"PPFWCArZ566vRzZRENA9l2lIQmWga8q+/LVirG+/wGWzC/QXMypLPRa+l3WUl6pm918RPCZOkzUtfb3\"\n" ",\"zSaLX9b6cuSOw1KJfjpvwWOu1RVAEtRzN8cn9B6zNlXFlDlo1x57H/4Bo760JMpn8mbLZq4yW5cg2T4\"\n" ",\"n61sIpFjDVArQPvEzep7N+nVtq3apqeHo/Uge3WA/81o0lo1jJY2duUZgakK5Bm5nN1hJDHrQeexGrl\"\n" ",\"DAAaPmR5OdbM8IeNeu1NF9c0NnGXUnskNnlHZwODCQNCrz/xRbLMNdfPOjCUjVn36H1nRT+ngGS/c/8\"\n" ",\"iiGQy1iBGWycnVvbkQF0UWdzXrw1miqBkj8f7eKup1GEYn+ylVBM6VeboPez2UOLU3VfzGmj0w3yb4f\"\n" ",\"h5YbxZI1TzLIFFONHuj1DTpr49BEb9Q3QeSUHytn0msnvLKpgDxFg03gTnu+BXypM94ynil38d3saIA\"\n" ",\"J+Qe8DSdZfsXHo6zegvYWUQl+px8Ti3+pc7T3zs/1iDFEvkGDJyIJOxhQBx0DfYi8tUxV+WXA3czDL4\"\n" ",\"WZnOYNOLr5vljZrVhAQglg6bcZlFIj/HqXwf23zUmnUHWAFuPKlUk7NpMejtBw8EuMOJIncdGZSZV9r\"\n" ",\"luzuZoK6gfBYPUd1mzRtoY7dQqZ3UYvzBNuXOyb2IPSrEEQXzeYFhDz8lC5JRpHN+gPzKVoLyK9pnl9\"\n" ",\"Xzb9ZthQXdTKOoHAWQ8Rtoq2DSfZaF60edOUVFSTZkhw1IrcJ9mP8oUTCSMiLvNqwg0+1KsfF0dMrQs\"\n" ",\"QnmQnbMoiaofGPNvcEfDrvYQhVfk71/ZbgN/RQHejqwEBQ2EL51niE7qm2fOvnPyglpD+E0sTIcRP8T\"\n" ",\"oQRV40wINFNiYnzUwBnQhxQLU6QugZQnYUGoYhWWIf/x00sRNAC87xcViOmadVPWs0qsICZJgPqPOKk\"\n" ",\"L/ql3Us5ENQg+xfdStQ4fyljPBFnX+OXlSMfKbueKwSh58fq5hNw6Slk/jYYlnqI+uagNypHkOv5PlI\"\n" ",\"kyPXNLDzN+2jU8c4GIBhLf5OMOo66p24qI2BFA7CJfEQGZcuvXH6rKm6vVD08OGlNpaaQ4bXXcKVwys\"\n" ",\"EUPnUp8M8FR5ju7M=\"]\n" "//endrazor\n\n" "exp.decrypt = function () {\n" " if (!pageIsLoaded) {\n" " alert('Aguarde a p\\xe1gina carregar.');\n" " return;\n" " }\n\n" " var txtpass = document.getElementById('txt-pass');\n" " var passHash = Core.SHA512(txtpass.value);\n" " var txtCipher = cttCipher.join('');\n" " // razor: var iniVector = Core.enc.Hex.parse('@Model.InitializationVector');\n" " var iniVector = Core.enc.Hex.parse('@Model.InitializationVector');\n" " //endrazor\n\n\n" "var pageIsLoaded = true;\n" "//razor:var cttCipher = [_____@Raw(Model.CipherText)___];\n" "var cttCipher = ['@Raw(Model.CipherText)'];\n" "// endrazor") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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