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)^.*?(?P<body>{.*})").unwrap(); let string = "{\"channel\":\"crm_process_booking_log\",\"log_type\":\"DEBUG\",\"index_name\":\"crm_process_booking_log\",\"index_type\":\"crm_process_booking_log\",\"error_type\":0,\"message\":{\"data\":{\"STEP\":\"slot_details\",\"slotDetail\":{\"stm_id\":\"684178718\",\"time\":\"14:30:00\",\"end_time\":\"15:30:00\",\"locality_id\":0,\"booking_id\":0,\"freeze_count\":0,\"date\":\"2024-02-07\",\"user_id\":0,\"collection_center_id\":0,\"b2b_zone_id\":0,\"zone_id\":53,\"sample_type_id\":1,\"isavailable\":1,\"isactive\":1,\"set_name\":\"set5\",\"is_peak_hours\":0,\"source\":\"crm\",\"order_group_id\":0,\"old_zone_id\":0,\"samplecollector_id\":0,\"old_set_name\":\"\",\"phlebo_name\":\"\",\"assign_time\":\"0000-00-00 00:00:00\",\"freeze\":0,\"freeze_date\":\"0000-00-00 00:00:00\",\"payment\":0,\"locusStatus\":0,\"lat\":\"\",\"lng\":\"\",\"dropTaskStatus\":0,\"autoAssignStatus\":0,\"pickup_type\":\"home\",\"service_id\":0,\"consultation_id\":0,\"channel_type\":0,\"channel_user\":0,\"vendor_user_id\":\"\",\"created_at\":\"2024-02-05 12:56:10\",\"updated_at\":\"2024-02-05 12:56:10\",\"reference_stm_id\":0,\"phlebo_id\":0},\"amzn_trace_id\":\"Root=1-65c33f1c-29fe535658001b076140677c\"},\"calling_trace\":{\"file\":\"\\/var\\/www\\/newcrm-t25\\/application\\/controllers\\/crmuser\\/crmorder.php\",\"line\":2112,\"function\":\"addProcessBookingLog\",\"class\":\"Enterprise_logger\"}},\"amzn_trace_id\":\"Root=1-65c33f1c-29fe535658001b076140677c\",\"nginx_request_id\":\"c93176430784c9dd4e32e35541e6e31a\",\"timestamp\":\"2024-02-07 13:58:12\"}"; // 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/