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"(?s)([A-Z-]{2,},*\s(?:[A-Za-z\s,().]|[A-Za-z]-[A-Za-z])+)\s[-*•.■ ]\s*(?:([A-Z](?:(?!\s+-|\s+Choice\s*-).)*?\w)(?:\s+-\s*|\s+(?=Choice\s*-)|\s*$))?((?:(?![A-Z-]{2,},*\s(?:[A-Za-z\s,().]|[A-Za-z]-[A-Za-z])+\s[-*•.■ ]).)*)").unwrap(); let string = " Choice - v8 - 0 ’71 - pl074 MA, Huan • Ying-Yai Sheng-Lan AHR - v76 - D ’71 - pl578 GJ - vl37 - Je ’71 - p213 JAS - v31 - N ’71 - pl81 TLS - Je 16 ’72 - p681 MA, Laurence J C - Commercial Development And Urban Change In Sung China 960-1279 JAS - v31 - Ag ’72 - p928 Pac A - v45 - Summer ’72 - p285 MA, Laurence J C - The Environment JAS - v42 - N ’82 - pl39 MA, Laurence J C - Urban Development In Modern China Choice - vl9 - Ja ’82 - p696 JAS - v42 - N 82 - pl39 MA, Nancy Chih - Cook Chinese AB - v45 - My 25 ’70 - pl786 PW - vl97 - Mr 23 ’70 - p38 MA, Nancy Chih • Don’t Lick The Chopsticks CSM - v66 - Ja 10 ’74 - pF2 LJ - v99 - Mr 15 ’74 - p757 MA, Nancy Chih - Mrs. Ma’s Japanese Cooking VQR - v58 - Spring ’82 - p68 MA, Tsu Sheng - Microscale Manipulations In Chemistry Choice-vl3-N ’76 -pi 164 MA, Tsu Sheng - Organic Functional Group Analysis By Gas Chromatography Choice - vl3 - F ’77 - pl624 r MA, Wei-Yi - A Bibliography Of Chinese-Language Materials On The People's Communes ARBA - vl5 - '84 - p320 Pac A - v56 - Winter ’83 - p796 MA, Wook - Seoul Ro Kanun Kil BL - v78 - 0 15 '81 - p294 y MA, Y W - Traditional Chinese Stories ANQ - vl8 - 0 ’79 - p30 BF - v4 - Ap 40 '79 - p575 Choice -vl5-Ja ’79 -pl528 HR-v32-Spring'79-pl23 JAS - v38 - Ag '79 - p773 Kliatt - vl3 • Winter '79 - p26 WIT - v53 - Summer '79 - p555 MA, Yun • Shih Ching T'ao Hsing BL - v68 - Ap 1 '72 - p651 MA BRICALL, Josep - Politica Economica De La Generalitat 1936-1939. Vol. 1 WP - v25 - O '72 - pl55 MA COY, Ramelle • Short-Time Compensation Choice - v21 - Jl '84 - pl648 Econ Bks - vll - S ’84 - p62 c MA De - The Cowherd And The Weaving Maid Cur R - v20 - S '81 -p325 c MA De - Crickets Cur R - v20 - S '81 - p325 c MA De - School-Master Dongguo Cur R - v20 - S '81 - p325 c MA De - Thrice Borrowing The Plantain Fan CurR- v20-S ’81 -p325 c MA De - The Wonderful Gourds Cur R - v20 - S '81 - p325 MAACK, Berthold - Preussen JMH - v55 - Mr '83 - p71 r MAACK, Mary N - Libraries In Senegal ARBA - vl3 - '82 - pi53 CRL - v45 - Mr '84-pl52 JAL - v7 - S '81 - p244 JLH - vl9 - Spring ’84 - p315 LJ - vl07 - My 1 ’82 - p865 LQ - v52 - Ap '82-pl75 MAACK, Reinhard • Kontinentaldrift Und Geologie Des Sudatlantischen Ozeans GJ - vl36 - Mr '70 - pl38 MAAG, Russell C - Observe And Understand The Sun S&T - v54 - S ’77 - p221 MAAG, Victor - Hiob Rel St Rev - vlO - Ap '84 - pi 75 MAAILMA Katettu Poyta WIT - vS8 • Winter '84 - pi 36 MAALOE, Ole - Control Of Macromolecular Synthesis Choice - v3 - 0 '66 - p676 Sci - vl54 - D 2 '66 - pll59 MAALOUF, Amin • The Crusades Through Arab Eyes TLS -N 16 ’84 -pi300 c MAAR, Len - Out-Of-Sight Games CBRS - v9 - F ’81 - p57 SLJ-v27 - Mr ’81 -pl48 p MAARAV Choice - vl6 - D '79 - pl280 MAAREK, Gerard • Introduction Au Capital De Karl Marx JEL - vl7 - Mr ’79 - p92 MAAS, Audrey Gellen • Wait Till The Sun Shines, Nellie "; // 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/