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)^ -{132}(?:\R(?! -{132}$|.*\bCUN\b).*)*+\R.*\bCUN\b.*(?:\R(?! -{132}$).*)*").unwrap(); let string = " ------------------------------------------------------------------------------------------------------------------------------------ ALPA MEAL CODE UPDATES: M* => PILOT PAID MEAL Mm => MEAL MOVED TO THIS SEGMENT Mc => THIS MEAL WAS CHANGED 1DSL EFF 04/01/19 THRU 04/30/19 737 LOS ANGELES APR 2019 04/01/19 PAGE 58 EQP FLT# DPT ARV DPTR ARVL GRND ML FTM ACM DTM IND D/C SU|MO TU WE TH FR|SA EFF 04/06/19 THRU 04/06/19 ID L5265 - BASIC (HNL) |-- -- -- -- --| 6 RPT: 0803 --|-- -- -- -- --|-- 37K 489 LAX DEN 0903 1228 1.02 2.25 2.25 --|-- -- -- -- --|-- 37K 1472 DEN SAN 1330 1447 16.38 L 2.17 4.42 6.59 .00 --|-- -- -- -- --|-- RLS: 1502 HTL: XXXXXX SAN DIEGO XXX-XXX-XXXX OP=> XXX-XXX-XXXX --|-- -- XXXXXX XXX-XXX-XXXX RPT: 0640 37X 662 SAN SFO 0725 0907 1.39 B 1.42 1.42 37K 1122 SFO HNL 1046 1328 20.32 L S 5.42 7.24 10.03 .00 RLS: 1343 HTL: XXXXXX WAIKIKI XXX-XXX-XXXX OP=> XXX-XXX-XXXX XXXXXX XXX-XXX-XXXX RPT: 0915 37K 1221 HNL LAX 1000 1834 1.16 L S 5.34 5.34 37K 2048 LAX LAS 1950 2112 17.23 1.22 6.56 9.12 .00 RLS: 2127 HTL: XXXXXX VEGAS XXX-XXX-XXXX OP=> XXX-XXX-XXXX XXXXXX XXX-XXX-XXXX RPT: 1350 37K 640 LAS ORD 1435 2012 1.03 3.37 3.37 37K 1186 ORD LAX 2115 2344 D 4.29 8.06 10.09 .00 RLS: 2359 DAYS- 4 CRD-27.08* FTM-27.08* TAFB- 87.56 INT- .00 NTE- .00 M$-229.74 T/C- .00 .34* ------------------------------------------------------------------------------------------------------------------------------------ EFF 04/12/19 THRU 04/12/19 ID L5266 - BASIC |-- -- -- -- --|-- RPT: 0803 --|-- -- -- -- 12|-- 73Q 489 LAX DEN 0903 1228 1.17 2.25 2.25 --|-- -- -- -- --|-- 37K 716 DEN AUS 1345 1653 1.02 L 2.08 4.33 --|-- -- -- -- --|-- 37K 630 AUS IAH 1755 1855 1.01 1.00 5.33 --|-- -- 37K 530 IAH SAT 1956 2059 17.10 1.03 6.36 11.11 .00 RLS: 2114 HTL: XXXXXX SAN ANTONIO XXX-XXX-XXXX OP=> XXX-XXX-XXXX XXXXXX XXX-XXX-XXXX RPT: 1324 73G 1967 SAT ORD 1409 1655 1.10 2.46 2.46 37K 246 ORD TPA 1805 2155 21.05 D 2.50 5.36 7.46 .00 RLS: 2210 HTL: XXXXXX TAMPA XXX-XXX-XXXX OP=> XXX-XXX-XXXX XXXXXX RPT: 1815 37K 352 TPA IAD 1900 2109 1.06 2.09 2.09 37K 1448 IAD LAX 2215 0049 D S 5.34 7.43 9.49 .00 RLS: 0104 DAYS- 4 CRD-20.00* FTM-19.55* TAFB- 65.01 INT- .00 NTE- 1.49 M$-159.29 T/C- .05 .25* ------------------------------------------------------------------------------------------------------------------------------------ EFF 04/15/19 THRU 04/15/19 ID L5267 - BASIC (CAM) |-- -- -- -- --|-- RPT: 0803 --|-- -- -- -- --|-- 73Q 489 LAX DEN 0903 1228 3.40 2.25 2.25 --|15 -- -- -- --|-- 37K 543 DEN MCO 1608 2137 15.53 3.29 5.54 10.49 .00 --|-- -- -- -- --|-- RLS: 2152 HTL: XXXXXX ORLANDO XXX-XXX-XXXX OP=> XXX-XXX-XXXX --|-- -- XXXXXX XXX-XXX-XXXX RPT: 1245 73Q 1601 MCO EWR 1330 1613 3.06 2.43 2.43 37K 1054 EWR CUN 1919 2220 18.40 D 4.01 6.44 11.05 .00 RLS: 2250 HTL: XXXXXX CANCUN XXX-XXX-XXXX OP=> XXX-XXX-XXXX XXXXXX XXX-XXX-XXXX RPT: 1615 37K 1118 CUN SFO 1700 2051 1.54 D S 5.51 5.51 37K 257 SFO LAX 2245 0020 1.35 7.26 10.20 .00 RLS: 0035 DAYS- 4 CRD-20.04* FTM-20.04* TAFB- 64.32 INT- 9.52 NTE- .00 M$-170.94 T/C- .00 .25* ------------------------------------------------------------------------------------------------------------------------------------"; // 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/