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

import java.util.regex.Matcher; import java.util.regex.Pattern; public class Example { public static void main(String[] args) { final String regex = "\\]\\sA\\s+(.*)(microsoft|office|azure|o365|onenote|outlook|windowsupdate)(\\(\\d+\\))(com|net|us)(\\(\\d+\\))\\s"; final String string = "10/6/2023 6:19:18 AM 149C PACKET 0000023A2A31D8A0 UDP Rcv 10.106.92.80 e32e Q [0001 D NOERROR] A (6)mobile(4)pipe(4)aria(9)microsoft(3)com(0)\n" + "UDP question info at 0000023A2A31D8A0\n" + " Socket = 816\n" + " Remote addr 10.106.92.80, port 54599\n" + " Time Query=5683788, Queued=0, Expire=0\n" + " Buf length = 0x0fa0 (4000)\n" + " Msg length = 0x0030 (48)\n" + " Message:\n" + " XID 0xe32e\n" + " Flags 0x0100\n" + " QR 0 (QUESTION)\n" + " OPCODE 0 (QUERY)\n" + " AA 0\n" + " TC 0\n" + " RD 1\n" + " RA 0\n" + " Z 0\n" + " CD 0\n" + " AD 0\n" + " RCODE 0 (NOERROR)\n" + " QCOUNT 1\n" + " ACOUNT 0\n" + " NSCOUNT 0\n" + " ARCOUNT 0\n" + " QUESTION SECTION:\n" + " Offset = 0x000c, RR count = 0\n" + " QTYPE A (1)\n" + " QCLASS 1\n" + " ANSWER SECTION:\n" + " empty\n" + " AUTHORITY SECTION:\n" + " empty\n" + " ADDITIONAL SECTION:\n" + " empty"; final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE); 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