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#"\"response-code\":\"(?<responsecode>[^\"]*)\".*\"description\":\"(?<description>[^\"]*)\""#).unwrap(); let string = "{\"sim-slot\":\"0\",\"terminal-vendor\":\"Vendor\",\"default-sms-app\":\"own\",\"screen-orientation\":\"portrait\",\"response-code\":\"200\",\"secondary-device-type\":\"\",\"international\":\"0\",\"subject-region\":\"Lat=0,Lon=0,Alt=0,Acc=0\",\"locale\":\"en_US\",\"timestamp\":\"2017-01-19T13:24:22.986+00:00\",\"user-agent\":\"IM-client/OMA1.0 model/brand-5.1 RCSAndrd/0.0.0 COMLib/0.00.00.rev00000\",\"evt-client-version\":\"0.0.0\",\"active-cs-call\":\"no\",\"sbc-ip\":\"99.99.9.999:9999\",\"transaction-id\":\"9aa99a9a-9aa9-99a9-a999-a9a9a999aa00\",\"init-service-tag\":\"audiocall\",\"description\":\"call-sip-invite-parent\",\"call-id\":\"ZZZZZZZZZZZ\",\"app-state\":\"foreground\",\"module\":\"cs\",\"terminal-sw-version\":\"0.0\",\"imsi\":\"99999999999\",\"remote-peer\":\"+99999999999\",\"cell-id\":\"99999\",\"platform\":\"phone-android\",\"client-version\":\"3.10.32.rev74692\",\"direction\":\"outgoing\",\"network-bearer\":\"CELLULAR_LTE\",\"terminal-model\":\"Model\",\"sim\":\"mcc(000),mnc(000)\",\"result\":\"success\",\"identity\":\"+999999999999\",\"device-id\":\"imei(9999999999),tac(99999)\"}"; // 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/