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

/
/
i

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#"(?i)<img(?:[\s\w="]+)src="([^"]+)"(?:[\s\w="]*)\/?>"#).unwrap(); let string = "<img src=\"image1.jpg\" width=\"200\" height=\"200\"> <div>\\r\\n<h2 class=\\\"ng-binding\\\" style=\\\"text-align: center;\\\"><span style=\\\"color: #ff0000;\\\">قيولي50 درصدي دانش آموزان در آزمون تيزهوشان</span></h2>\\r\\n</div>\\r\\n<div class=\\\"ng-scope\\\" style=\\\"text-align: center;\\\">\\r\\n<div class=\\\"groupsRowSeperator\\\">&nbsp;</div>\\r\\n<div id=\\\"contextData\\\">\\r\\n<h3 class=\\\"ng-scope\\\"><span style=\\\"color: #008000;\\\">افتخار آفريني تيزهوشاني&nbsp;</span></h3>\\r\\n<h3 class=\\\"ng-scope\\\"><span style=\\\"color: #800080;\\\">قبولي50 درصدي دانش آموزان دبستان هوشمند شهيد مهدوي&nbsp;در آزمون تيزهوشان&nbsp;سال تحصيلي&nbsp;99-98&nbsp;برگ زرين ديگري براي شما اولياي گرامي و همكاران محترم و نتيجه اطميناني بود كه به هم داشتيم.</span></h3>\\r\\n<h3 class=\\\"ng-scope\\\"><span style=\\\"color: #800080;\\\">اين موفقيت بزرگ را به كليه دانش آموزان عزيز ، والدين گرامي ، معلمين دلسوز ، همكاران پرتلاش دبستان هوشمند شهيد مهدوي تبريك و تهنيت عرض مي نمائيم.</span></h3>\\r\\n<p class=\\\"ng-scope\\\">&nbsp;</p>\\r\\n<p class=\\\"ng-scope\\\"><img src=\\\"http://mahdavi-smart-school.ir/upload/5/akhbar/97-98/IMG-20190805-WA0014.jpg\\\" alt=\\\"\\\" width=\\\"423\\\" height=\\\"1060\\\" /></p>\\r\\n</div>\\r\\n</div>\\r\\n<div class=\\\"CommentBox\\\" style=\\\"text-align: center;\\\">&nbsp;</div>"; // 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/