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 = "(?:(^[^:\\r\\n]+):?[\\r\\n]+|\\G(?!^))\\r?\\n[^:\\r\\n]+ : ([^\\r\\n]+(?:\\r?\\n(?!.* : )[ \\t]+[^\\r\\n]+)*)"; final String string = "Windows IP Configuration\n\n" + " Host Name . . . . . . . . . . . . : abcmyhost\n" + " Primary Dns Suffix . . . . . . . : parker.industries\n" + " Node Type . . . . . . . . . . . . : Hybrid-GLS\n" + " IP Routing Enabled. . . . . . . . : YES\n" + " WINS Proxy Enabled. . . . . . . . : YES\n" + " DNS Suffix Search List. . . . . . : parker1.industries\n" + " parker2.industries\n" + " parker3.industries\n" + " parker4.industries\n" + " parker5.industries\n" + " parker6.industries\n" + " parker7.industries\n" + " parker8.industries\n" + " parker9.industries\n" + " parker10.industries\n\n" + "Ethernet adapter Ethernet 5:\n\n" + " Connection-specific DNS Suffix . : parker.industries\n" + " Description . . . . . . . . . . . : Ready 2\n" + " Physical Address. . . . . . . . . : 60-11-11-31-09-XY\n" + " DHCP Enabled. . . . . . . . . . . : NO\n" + " Autoconfiguration Enabled . . . . : Yes\n" + " Link-local IPv6 Address . . . . . : AB80::11FG:1KI:LK9F:12N2%19(Preferred) \n" + " IPv4 Address. . . . . . . . . . . : 111.222.333.444(Preferred) \n" + " Subnet Mask . . . . . . . . . . . : 255.255.255.0\n" + " Lease Obtained. . . . . . . . . . : Monday, November 11, 2019 6:23:03 AM\n" + " Lease Expires . . . . . . . . . . : Wednesday, November 13, 2019 6:51:30 AM\n" + " Default Gateway . . . . . . . . . : 111.11.131.1\n" + " DHCP Server . . . . . . . . . . . : 111.22.144.199\n" + " DHCPv6 IAID . . . . . . . . . . . : 87244642462\n" + " DHCPv6 Client DUID. . . . . . . . : 00-01-02-03-04-05-06-07-08-09-10-11-E9-G7\n" + " DNS Servers . . . . . . . . . . . : 111.22.111.254 \n" + " 111.22.112.254\n" + " 111.33.113.254\n" + " 111.33.114.254\n" + " NetBIOS over Tcpip. . . . . . . . : Enabled"; 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