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

/
/

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"Total statistics:\s+(\d+)").unwrap(); let string = "{\"logSystem\":[[2019,4,26,10,37,0,44872,\"Battery Charge Started! 17.0°C 21.05Volt\",\"#000099\",\"normal\"],[2019,4,26,10,37,0,44871,\"Total statistics: 334418m, 23862min, blade on time: 21289min\",\"#2E2EFE\",\"bold\"],[2019,4,26,10,37,0,44870,\"Current cut statistics: 2m, 0min, blade on time: 0min\",\"#2E2EFE\",\"bold\"],[2019,4,26,10,37,0,44869,\"Landroid at home\",\"#996600\",\"normal\"],[2019,4,26,10,37,0,44868,\"Landroid searching home\",\"#996600\",\"normal\"],[2019,4,26,10,36,46,44867,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,36,43,44866,\"Landroid searching wire\",\"#996600\",\"normal\"],[2019,4,26,10,36,41,44865,\"[auto] message reset Close windows to go charge\",\"#FFA800\",\"normal\"],[2019,4,26,10,36,40,44864,\"Landroid start sequence\",\"#996600\",\"normal\"],[2019,4,26,10,36,40,44863,\"Home button pressed\",\"#FFA800\",\"normal\"],[2019,4,26,10,36,38,44862,\"[user] message reset Upside Down\",\"#FFA800\",\"normal\"],[2019,4,26,10,34,47,44861,\"Landroid Upside Down 41x-2y-0.6z\",\"#FF0000\",\"bold\"],[2019,4,26,10,34,42,44860,\"[user] message reset Trapped\",\"#FFA800\",\"normal\"],[2019,4,26,10,34,35,44859,\"[auto] message reset Outside working area\",\"#FFA800\",\"normal\"],[2019,4,26,10,29,20,44858,\"Landroid in idle state 16.4°C 20.33 Volt\",\"#996600\",\"normal\"],[2019,4,26,10,29,20,44857,\"Total statistics: 334416m, 23862min, blade on time: 21289min\",\"#2E2EFE\",\"bold\"],[2019,4,26,10,29,20,44856,\"Current cut statistics: 71m, 8min, blade on time: 0min\",\"#2E2EFE\",\"bold\"],[2019,4,26,10,29,20,44855,\"!ERROR! outside wire timeout\",\"#FF0000\",\"bold\"],[2019,4,26,10,28,54,44854,\"[Wifi] Connected\",\"#2E2EFE\",\"normal\"],[2019,4,26,10,28,36,44853,\"[Wifi] Connection Lost!\",\"#2E2EFE\",\"normal\"],[2019,4,26,10,25,6,44852,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,25,4,44851,\"Landroid searching home\",\"#996600\",\"normal\"],[2019,4,26,10,24,54,44850,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,24,54,44849,\"Landroid searching home\",\"#996600\",\"normal\"],[2019,4,26,10,24,28,44848,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,24,25,44847,\"Landroid searching wire\",\"#996600\",\"normal\"],[2019,4,26,10,23,42,44846,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,23,39,44845,\"Landroid searching wire\",\"#996600\",\"normal\"],[2019,4,26,10,22,58,44844,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,22,54,44843,\"Landroid searching wire\",\"#996600\",\"normal\"],[2019,4,26,10,22,54,44842,\"Flowerbed loop detected leaving...\",\"#FFA800\",\"normal\"],[2019,4,26,10,21,36,44841,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,26,10,21,22,44840,\"Landroid searching wire\",\"#996600\",\"normal\"],[2019,4,26,10,21,22,44839,\"[Battery LOW] homing req, status: 14.8°C 23.65Volt\",\"#FFA800\",\"normal\"],[2019,4,26,10,21,13,44838,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,26,10,21,10,44837,\"[auto] message reset Close windows to start\",\"#FFA800\",\"normal\"],[2019,4,26,10,21,9,44836,\"Landroid start sequence\",\"#996600\",\"normal\"],[2019,4,26,10,21,9,44835,\"Start button pressed\",\"#FFA800\",\"normal\"],[2019,4,26,10,21,7,44834,\"[user] message reset Trapped\",\"#FFA800\",\"normal\"],[2019,4,26,10,21,3,44833,\"[Wifi] Connected\",\"#2E2EFE\",\"normal\"],[2019,4,26,10,20,51,44832,\"Landroid in idle state 14.7°C 24.20 Volt\",\"#996600\",\"normal\"],[2019,4,26,10,20,51,44831,\"Power On v: 2.45\",\"#000000\",\"bold\"],[2019,4,25,19,36,18,44830,\"Shutdown 24.07Volt\",\"#000000\",\"bold\"],[2019,4,25,19,36,18,44829,\"Landroid idle shutdown timer\",\"#FFA800\",\"normal\"],[2019,4,25,19,16,18,44828,\"Landroid in idle state 37.6°C 24.05 Volt\",\"#996600\",\"normal\"],[2019,4,25,19,16,18,44827,\"Total statistics: 334345m, 23854min, blade on time: 21289min\",\"#2E2EFE\",\"bold\"],[2019,4,25,19,16,18,44826,\"Current cut statistics: 1087m, 76min, blade on time: 76min\",\"#2E2EFE\",\"bold\"],[2019,4,25,19,16,17,44825,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,25,19,16,15,44824,\"Landroid searching home\",\"#996600\",\"normal\"],[2019,4,25,19,16,9,44823,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,25,19,16,9,44822,\"Landroid searching home\",\"#996600\",\"normal\"],[2019,4,25,19,16,5,44821,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,25,19,15,58,44820,\"Landroid lift recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,15,57,44819,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,25,19,15,55,44818,\"Landroid searching home\",\"#996600\",\"normal\"],[2019,4,25,19,15,50,44817,\"Landroid following wire\",\"#996600\",\"normal\"],[2019,4,25,19,15,50,44816,\"Landroid searching wire\",\"#996600\",\"normal\"],[2019,4,25,19,15,50,44815,\"[Battery LOW] homing req, status: 37.6°C 23.97Volt\",\"#FFA800\",\"normal\"],[2019,4,25,19,15,28,44814,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,15,24,44813,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,12,26,44812,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,12,19,44811,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,10,49,44810,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,10,44,44809,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,9,22,44808,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,9,18,44807,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,8,32,44806,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,8,27,44805,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,8,26,44804,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,8,22,44803,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,7,55,44802,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,7,51,44801,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,6,0,44800,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,5,55,44799,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,5,6,44798,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,5,2,44797,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,4,10,44796,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,4,5,44795,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,3,29,44794,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,3,25,44793,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,3,25,44792,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,3,21,44791,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,2,58,44790,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,2,54,44789,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,2,52,44788,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,2,47,44787,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,2,43,44786,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,2,39,44785,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,2,23,44784,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,2,18,44783,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,2,6,44782,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,2,2,44781,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,1,0,44780,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,0,54,44779,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,0,54,44778,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,0,48,44777,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,19,0,46,44776,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,19,0,42,44775,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"],[2019,4,25,18,59,21,44774,\"Landroid grass cutting\",\"#996600\",\"normal\"],[2019,4,25,18,59,17,44773,\"Landroid trapped recovery procedure\",\"#996600\",\"normal\"]]}"; // result will be a tuple containing the start and end indices for the first match in the string let result = regex.captures(string); let (start, end) = match result { Some((s, e)) => (s, e), None => { // ... } }; println!("{}", &string[start, end]); }

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/