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

r"
"
gm

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"(?m)(@|:)[^/),]*").unwrap(); let string = "(Esy@ESY15_g64743_DN3_SP7_c0:0.0726396855636,Aar@AA_maker7399_1:0.137507902808,((Spa@Tp2g18720:0.0318934795022,Cpl@CP2_g48793_DN3_SP8_c:0.0273465005242):9.05326020871e-05,(((Bst@Bostr_13083s0053_1:0.0332592496158,((Aly@AL8G21130_t1:0.0328569260951,Ath@AT5G48370_1:0.0391706378372):0.0205924636564,(Chi@CARHR183840_1:0.0954469923893,Cru@Carubv10026342m:0.0570981548016):0.00998579652059):0.0150356382287):0.0340484449097,(((Hco@scaff1034_g23864_DN3_SP8_c_TE35_CDS100:0.00823215335663,Hlo@DN13684_c0_g1_i1_p1:0.0085462978729):0.0144626717872,Hla@DN22821_c0_g1_i1_p1:0.0225079453622):0.0206478928557,Hse@DN23412_c0_g1_i3_p1:0.048590776459):0.0372829371381):0.00859075940423,(Esa@Thhalv10004228m:0.0378509854703,Aal@Aa_G102140_t1:0.0712272454125):1.00000050003e-06):0.00328120860999):0.0129090235079):0.0129090235079;"; // 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/