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

/
/
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)^(.+\s-\s\w{2})$|^(Total\s\d{1,5}:.+)$").unwrap(); let string = "Total 2015 DOLLAR AMOUNT Oct-15 DIFF 15-16 Total 2015 COMPANY 1 - WI Nuts $ 59.85 $ 0.00 $ 135.45 $ 0.00 $ 135.45 $0.00 Bolts $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $0.00 Screws $ 449.20 $ 0.00 $ 541.23 $ 0.00 $ 541.23 $0.00 Total 7765: $ 509.05 $ 0.00 $ 676.68 $ 0.00 $ 676.68 $0.00 Company 2 - NE Nuts $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $0.00 Bolts $ 0.00 $ 55.67 $ 542.48 $ 719.82 $(177.34) $777.02 Total 1876: $ 0.00 $ 55.67 $ 2,960.52 $ 4,265.82 $(1,305.30) $5,854.60 Company 3 - MN Nuts $ 109.52 $ 606.52 $ 858.36 $ 606.52 $ 251.84 $606.52 Paper $ 0.00 $ 0.00 $ 483.82 $ 0.00 $ 483.82 $678.30 Gas $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $0.00 OTHER $ 521.49 $ 0.00 $ 521.49 $ 0.00 $ 521.49 $0.00 Total 6524: $ 631.01 $ 606.52 $ 3,909.09 $ 606.52 $ 3,302.57 $1,284.82 Company 4 - IA Anything $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $0.00 Other $ 0.00 $ 0.00 $ 171.90 $ 0.00 $ 171.90 $0.00 Total 1123: $ 0.00 $ 0.00 $ 171.90 $ 0.00 $ 171.90 $0.00"; // 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/