Regular Expressions 101

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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"const r = new WillyRouter\(\);([\s\S]*?)Vue.use\(VueRouter\);") test_str = ("import { routerConfig } from '@portaal/routes/global.js';\n" "import WillyRouter from '@portaal/router.js';\n\n" "import routesKwaliteitsdocumenten from './routes/kwaliteitsdocumenten.js';\n" "import routesKennisbank from './routes/kennisbank.js';\n" "import routesWiki from './routes/wiki.js';\n\n" "const r = new WillyRouter();\n\n" "// Custom routes toevoegen, verwijderen etc\n" "r.add('custom_dms', routesKwaliteitsdocumenten);\n" "r.add('custom_wiki', routesWiki);\n" "r.add('custom_kennisbank', routesKennisbank);\n" "// r.changeByName('groep.informatie', {\n" "// component: CustomComponent,\n" "// });\n" "// r.removeByName('beeldbank-beelden-beeldbankClienten');\n\n" "Vue.use(VueRouter);\n\n" "const router = new VueRouter({\n" " ...routerConfig,\n" " routes: r.getAll(),\n" "});\n\n" "export default router;\n") match = regex.search(test_str) if match: print(f"Match 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