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 = "(?'gPatSyslogPRI'<\\d+>)\n" + "(?'gPatMesgBody'.*)\n" + "(?'gPatMesgBodyMin'.*?)\n" + "(?'gPatSyslogNGHeader'\\w{3}\\s+\\d{1,2}\\s\\d{1,2}:\\d{1,2}:\\d{1,2}\\s\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})\n" + "(?'gPatMon'Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec|\\d{1,2})\n" + "(?'gPatMonNum'\\d{1,2})\n" + "(?'gPatDay'\\d{1,2})\n" + "(?'gPatTime'\\d{1,2}:\\d{1,2}:\\d{1,2})\n" + "(?'gPatYear'\\d{2,4})\n" + "(?'gPatMSec'\\d{1,3})\n" + "(?'gPatTimeMSec'\\d{1,2}:\\d{1,2}:\\d{1,2}\\.\\d{1,3})\n" + "(?'gPatTimeZone'Z|UTC|[+-]\\d{1,2}:?\\d{2})\n" + "(?'gPatWeekday'Mon|Tue|Wed|Thu|Fri|Sat|Sun)\n" + "(?'gPatIpV4Dot'\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})\n" + "(?'gPatIpAddr'[0-9A-Fa-f]{0,4}(?::[0-9A-Fa-f]{0,4}){1,5}:(?:\\d{1,3}(?:\\.\\d{1,3}){3}|[0-9A-Fa-f]{0,4}(?::[0-9A-Fa-f]{0,4})?)|\\d{1,3}(?:\\.\\d{1,3}){3})\n" + "(?'gPatIpPort'\\d{1,5})\n" + "(?'gPatProto'ftp|icmp|tcp|udp|http|ip|smb|smtp|snmp|others|FTP|ICMP|UDP|TCP|HTTP|IP|SMB|SMTP|SNMP|OTHERS)\n" + "(?'gPatFqdn'\\w+[.\\w+]+)\n" + "(?'gPatWord'\\w+)\n" + "(?'gPatStr'[^\\s]*)\n" + "(?'gPatHostName'[\\w.-]+)\n" + "(?'gPatStrComma'[^,]*)\n" + "(?'gPatStrLeftParen'[^\\(]*)\n" + "(?'gPatStrRightSB'[^\\]]*)\n" + "(?'gPatInt'\\d+)\n" + "(?'gPatSpace'\\s+)\n" + "(?'gPatStrEndColon'[^:]*)\n" + "(?'gPatStrSQ'[^']*)\n" + "(?'gPatStrDQ'[^']*)\n" + "(?'gPatSentence'\\w[\\s+\\w]*)"; final String string = ""; 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