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

r"
"
gs

Test String

Code Generator

Language

Generated Code

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "DELETE.*?DELETE[^\\n]*\\n(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})"; final String string = "192.168.10.20 - - [18/Jul/2017:08:41:37 +0000] \"DELETE /search/tag/list HTTP/1.0\" 200 5042 \"http://cooper.com/homepage/\" \"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/5342 (KHTML, like Gecko) Chrome/14.0.870.0 Safari/5342\"\n" + "10.30.24.3 - - [18/Jul/2017:08:45:15 +0000] \"DELETE /search/tag/list HTTP/1.0\" 200 4939 \"http://www.cole-brown.net/category/main/list/privacy/\" \"Mozilla/5.0 (X11; Linux i686) AppleWebKit/5322 (KHTML, like Gecko) Chrome/14.0.843.0 Safari/5322\"\n" + "98.5.45.3 - - [18/Jul/2017:08:45:49 +0000] \"GET /apps/cart.jsp?appID=8471 HTTP/1.0\" 200 4958 \"http://knight-chase.com/post.jsp\" \"Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10_7_3; rv:1.9.6.20) Gecko/2013-11-03 17:44:01 Firefox/3.8\""; final Pattern pattern = Pattern.compile(regex, Pattern.DOTALL); final Matcher matcher = pattern.matcher(string); while (matcher.find()) { System.out.println("Full match: " + matcher.group(0)); for (int i = 1; i <= matcher.groupCount(); i++) { System.out.println("Group " + i + ": " + matcher.group(i)); } } } }

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 Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html