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"
"
gs

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)Card number:\s(\d+\*+\d+)(?:(?!Card number:).)*?ID:\s*(\d*)(?:(?:(?!Card number:).)*?Total cash dispensed:\s*([a-zA-Z0-9]+)\s+([a-zA-Z0-9]+))?").unwrap(); let string = "Card number: 99280*********8823, SEQ: 182 Current session ID: 182 21/01/2021 08:46:49 : Selected language : French 21/01/2021 08:46:49 : Chip application : NO Active 21/01/2021 09:53:03 : Returned code : 0 21/01/2021 09:53:03 : Pin entered 21/01/2021 09:53:09 : Transaction selected: FastCash 40000 on ATM: Y6154514 21/01/2021 09:53:10 : Returned code : 0 21/01/2021 09:53:13 : FastCash Authorization requested !XXXXXXXXXXXXXXX3947#20210121065319#686817#0001969C0007469460900002969C000740946090# 21/01/2021 09:53:14 : FastCash Authorized Returned code : 0, STAN: 686817 21/01/2021 09:53:27 : Cash dispensed 21/01/2021 09:53:28 : Card ejected 21/01/2021 09:53:29 : Card taken 21/01/2021 09:53:32 : Dispense details: ->cass 1: 0 x 5000 MGA, cass 2: 4 x 10000 MGA ->cass 3: 0 x 10000 MGA, cass 4: 0 x 20000 MGA ------->Total cash dispensed: 40000 MGA 21/01/2021 09:53:32 : Cash presented 21/01/2021 09:53:32 : Waiting for cash to be taken 21/01/2021 09:53:33 : Cash taken 21/01/2021 09:53:39 : Transaction completed 21/01/2021 09:53:41 : Session terminated Card number: 6700*********8823, SEQ: 177 Current session ID: 177 21/01/2021 10:04:06 : Selected language : French 21/01/2021 10:04:06 : Chip application : A0000000031010 21/01/2021 10:04:53 : Returned code : 0 21/01/2021 10:04:54 : Pin entered 21/01/2021 10:05:03 : Transaction selected: BalanceInquiry on ATM: Y892614 21/01/2021 10:05:04 : Returned code : 0 21/01/2021 10:05:09 : BalanceInquiry Authorization requested !XXXXXXXXXXXX8727#20210121070516#686824 21/01/2021 10:05:10 : BalanceInquiry Authorized Returned code : 0, STAN: 686824 21/01/2021 10:05:11 : Chip Authorization approved 21/01/2021 10:05:18 : Transaction completed 21/01/2021 10:05:38 : Transaction selected: Statement on ATM: Y892614 21/01/2021 10:05:43 : Statement Authorization requested !XXXXXXXXXXXX8727#20210121070550#686825# 21/01/2021 10:05:44 : Statement Authorized Returned code : 0, Auth: 686825 21/01/2021 10:05:45 : Chip authorization declined 21/01/2021 10:06:00 : Card ejected 21/01/2021 10:06:01 : Card taken 21/01/2021 10:06:03 : Session terminated Card number: 99280*********8823, SEQ: 182 Current session ID: 182 21/01/2021 08:46:49 : Selected language : French 21/01/2021 08:46:49 : Chip application : NO Active 21/01/2021 09:53:03 : Returned code : 0 21/01/2021 09:53:03 : Pin entered 21/01/2021 09:53:09 : Transaction selected: FastCash 40000 on ATM: Y6154514 21/01/2021 09:53:10 : Returned code : 0 21/01/2021 09:53:13 : FastCash Authorization requested !XXXXXXXXXXXXXXX3947#20210121065319#686817#0001969C0007469460900002969C000740946090# 21/01/2021 09:53:14 : FastCash Authorized Returned code : 0, STAN: 686817 21/01/2021 09:53:27 : Cash dispensed 21/01/2021 09:53:28 : Card ejected 21/01/2021 09:53:29 : Card taken 21/01/2021 09:53:32 : Dispense details: ->cass 1: 0 x 5000 MGA, cass 2: 4 x 10000 MGA ->cass 3: 0 x 10000 MGA, cass 4: 0 x 20000 MGA ------->Total cash dispensed: 40000 MGA 21/01/2021 09:53:32 : Cash presented 21/01/2021 09:53:32 : Waiting for cash to be taken 21/01/2021 09:53:33 : Cash taken 21/01/2021 09:53:39 : Transaction completed 21/01/2021 09:53:41 : Session terminated"; // 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/