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
No Match

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"(((\+49\ ))|(0))\d{3,4}\ (\d{7}|\d{6}(\-\d{2})?)").unwrap(); let string = "// valid //Landline 0221 999985 0221 999985-80 // Mobile 01578 1234567 // International +49 221 999985 +49 221 999985-60 +49 1578 1234567 // invalid (06442) 3933023 (02852) 5996-0 (042) 1818 87 9919 06442 / 3893023 06442 / 38 93 02 3 06442/3839023 042/ 88 17 890 0 +49 221 549144 – 79 +49 221 - 542194 79 +49 (221) - 542944 79 0 52 22 - 9 50 93 10 +49(0)121-79536 - 77 +49(0)2221-39938-113 +49 (0) 1739 906-44 +49 (173) 1799 806-44 0173173990644 +4922154219479 0214154914479 02141 54 91 44 79 01517953677 +491517953677 015777953677 02162 - 54 91 44 79 (02162) 54 91 44 79 saddsadasdasd asdasd asdasd asdasd asd asdasd kjn asohas asdoiasd 23434 234 234 23 323 23434 234----234 ///// ---- // id8834 3493934 // "; let substitution = ""; // result will be a String with the substituted value let result = regex.replace_all(string, substitution); println!("{}", 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 Rust, please visit: https://docs.rs/regex/latest/regex/