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#"var datas ?= ?\{ ?(?: ?"[^"]+" ?: ?\{ ?"titre" ?: ?(?:(?:"(?:[^"]|\\")*[^\\]")|(?:'(?:[^']|\\')*[^\\]')) ?, ?(?:"\d+" ?: ?\d+ ?(?:(?:, ?(?=(?:"\d)|\}))|(?=\}))){1,} ?\} ?(?:(?:, ?(?=["}]))|(?=\}))){2,7}\}"#).unwrap(); let string = "var datas = { \"XiaoMei\": { \"titre\" : \"Xiao-Mei\", \"0\" : 113, \"1\" : 39, \"2\" : 128, \"3\" : 386, \"4\" : 481, \"5\" : 69, \"6\" : 25, \"7\" : 142, \"8\" : 141, \"9\" : 32, \"10\" : 533, \"11\" : 27, \"12\" : 87, \"13\" : 125, \"14\" : 124, \"15\" : 98, \"16\" : 531 }, \"RossBelles\": { \"titre\" : \"Scott Ross, les + belles\", \"0\" : 1, \"1\" : 9, \"2\" : 14, \"3\" : 27, \"4\" : 38, \"5\" : 103, \"6\" : 114, \"7\" : 141, \"8\" : 208, \"9\" : 213, \"10\" : 296, \"11\" : 297, \"12\" : 298, \"13\" : 299, \"14\" : 380, \"15\" : 490, \"16\" : 491, \"17\" : 492, \"18\" : 555 }, \"Ross561\": { \"titre\" : \"Scott Ross, antho. 1\", \"0\" : 33, \"1\" : 34, \"2\" : 60, \"3\" : 67, \"4\" : 69, \"5\" : 87, \"6\" : 94, \"7\" : 95, \"8\" : 96, \"9\" : 97, \"10\" : 104, \"11\" : 107, \"12\" : 113, \"13\" : 114, \"14\" : 132, \"15\" : 133, \"16\" : 140, \"17\" : 141, \"18\" : 144, \"19\" : 145 }, \"Ross562\": { \"titre\" : \"Scott Ross, antho. 2\", \"0\" : 146, \"1\" : 178, \"2\" : 187, \"3\" : 201, \"4\" : 203, \"5\" : 204, \"6\" : 205, \"7\" : 208, \"8\" : 209, \"9\" : 211, \"10\" : 212, \"11\" : 213, \"12\" : 214, \"13\" : 238, \"14\" : 239, \"15\" : 259, \"16\" : 260 }, \"Ross563\": { \"titre\" : \"Scott Ross, antho. 3\", \"0\" : 241, \"1\" : 261, \"2\" : 262, \"3\" : 298, \"4\" : 318, \"5\" : 319, \"6\" : 364, \"7\" : 365, \"8\" : 366, \"9\" : 381, \"10\" : 402, \"11\" : 403, \"12\" : 426, \"13\" : 427, \"14\" : 429, \"15\" : 455, \"16\" : 513, \"17\" : 544, \"18\" : 545 }, \"Staier\": { \"titre\" : \"Staier\", \"0\" : 427, \"1\" : 426, \"2\" : 415, \"3\" : 414, \"4\" : 209, \"5\" : 208, \"6\" : 247, \"7\" : 246, \"8\" : 513, \"9\" : 216, \"10\" : 215, \"11\" : 114, \"12\" : 113, \"13\" : 69, \"14\" : 116, \"15\" : 115, \"16\" : 395, \"17\" : 394} } "; // 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/