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

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"(Trotz­dem\s*?(?:<\/?[^>]*?>)?\s*?gibt\s*?(?:<\/?[^>]*?>)?\s*?es\s*?(?:<\/?[^>]*?>)?\s*?Unter­su­chun­gen,\s*?(?:<\/?[^>]*?>)?\s*?die\s*?(?:<\/?[^>]*?>)?\s*?nahe­le­gen,\s*?(?:<\/?[^>]*?>)?\s*?dass\s*?(?:<\/?[^>]*?>)?\s*?bis\s*?(?:<\/?[^>]*?>)?\s*?zu\s*?(?:<\/?[^>]*?>)?\s*?20%\s*?(?:<\/?[^>]*?>)?\s*?der\s*?(?:<\/?[^>]*?>)?\s*?Stu­die­ren­den\s*?(?:<\/?[^>]*?>)?\s*?in\s*?(?:<\/?[^>]*?>)?\s*?Deutsch­land\s*?(?:<\/?[^>]*?>)?\s*?wäh­rend\s*?(?:<\/?[^>]*?>)?\s*?der\s*?(?:<\/?[^>]*?>)?\s*?Prü­fungs­vor­be­rei­tung\s*?(?:<\/?[^>]*?>)?\s*?Rita­lin\s*?(?:<\/?[^>]*?>)?\s*?ein­schmeis­sen\s*?(?:<\/?[^>]*?>)?\s*?\[2\],\s*?(?:<\/?[^>]*?>)?\s*?Repor­ta­gen,\s*?(?:<\/?[^>]*?>)?\s*?dass\s*?(?:<\/?[^>]*?>)?\s*?bri­ti­sche\s*?(?:<\/?[^>]*?>)?\s*?Stu­die­rende\s*?(?:<\/?[^>]*?>)?\s*?Moda­fi­nil\s*?(?:<\/?[^>]*?>)?\s*?bes­tens\s*?(?:<\/?[^>]*?>)?\s*?ken­nen\[3\]\s*?(?:<\/?[^>]*?>)?\s*?und\s*?(?:<\/?[^>]*?>)?\s*?Stu­die­rende\s*?(?:<\/?[^>]*?>)?\s*?welt­weit\s*?(?:<\/?[^>]*?>)?\s*?auch\s*?(?:<\/?[^>]*?>)?\s*?nach\s*?(?:<\/?[^>]*?>)?\s*?der\s*?(?:<\/?[^>]*?>)?\s*?Silk\s*?(?:<\/?[^>]*?>)?\s*?Road — einem\s*?(?:<\/?[^>]*?>)?\s*?mitt­ler­weile\s*?(?:<\/?[^>]*?>)?\s*?ein­ge­stell­ten\s*?(?:<\/?[^>]*?>)?\s*?Schwarz­markt\s*?(?:<\/?[^>]*?>)?\s*?im\s*?(?:<\/?[^>]*?>)?\s*?Deep\s*?(?:<\/?[^>]*?>)?\s*?Web – mit\s*?(?:<\/?[^>]*?>)?\s*?ille­ga­len\s*?(?:<\/?[^>]*?>)?\s*?„Nootro­pics“\s*?(?:<\/?[^>]*?>)?\s*?experimentieren\.)").unwrap(); let string = "<p>Die <span class=\"caps\">GDS</span> zeich­net also das Bild einer Gesell­schaft, in der Dro­gen pri­mär Rausch, Genuss und Spass sind. Tabak ist zwar das bekann­teste – und unge­sün­deste – Mit­tel gegen Stress, aber sonst sind die Leis­tungs­stei­ge­rer in der Liste weit abge­schla­gen. Trotz­dem gibt es Unter­su­chun­gen, die nahe­le­gen, dass bis zu 20% der Stu­die­ren­den in Deutsch­land wäh­rend der Prü­fungs­vor­be­rei­tung Rita­lin ein­schmeis­sen <a href=\"#_ftn2\" name=\"_ftnref2\">[2]</a>, Repor­ta­gen, dass bri­ti­sche Stu­die­rende Moda­fi­nil bes­tens ken­nen<a href=\"#_ftn3\" name=\"_ftnref3\">[3]</a> und Stu­die­rende welt­weit auch nach der <a href=\"https://de.wikipedia.org/wiki/Silk_Road\" target=\"_blank\">Silk Road</a> — einem mitt­ler­weile ein­ge­stell­ten Schwarz­markt im Deep Web – mit ille­ga­len „Nootro­pics“ experimentieren.</p>"; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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/