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

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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"<\?xml(.+?)\?>").unwrap(); let string = "<?xml version=\"1.0\" encoding=\"utf-8\"?> <ns1:StudySQL_response xmlns:ns1=\"urn:global:cs:jdbc:study\"> <Statement_response> <row> <XMLTYPE.GETSTRINGVAL(MESSAGE)>&lt;study studypid=&quot;200&quot;&gt; &lt;studyname&gt;&amp;quot;Immume Treat Phase3&amp;quot;&lt;/studyname&gt; &lt;statusCD&gt;ongoing&lt;/statusCD&gt; &lt;clinicalphase&gt;III&lt;/clinicalphase&gt; &lt;primaryIndication&gt;for lung cancer&lt;/primaryIndication&gt; &lt;startDate&gt;2010-Jun-28&lt;/startDate&gt; &lt;/study&gt; </XMLTYPE.GETSTRINGVAL(MESSAGE)> </row> <row> <XMLTYPE.GETSTRINGVAL(MESSAGE)>&lt;study studypid=&quot;201&quot;&gt; &lt;studyname&gt;&amp;quot;ABPM Study&amp;quot;&lt;/studyname&gt; &lt;statusCD&gt;on hold&lt;/statusCD&gt; &lt;clinicalphase&gt;III&lt;/clinicalphase&gt; &lt;primaryIndication&gt;skin cancel&lt;/primaryIndication&gt; &lt;startDate&gt;2015-Mar-08&lt;/startDate&gt; &lt;/study&gt; </XMLTYPE.GETSTRINGVAL(MESSAGE)> </row> </Statement_response> </ns1:StudySQL_response> "; // 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/