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 = "192\\.168\\.(1?[0-9][0-9]?|2[0-4][0-9]|25[0-5])\\.([2-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-4])[[:space:]]"; final String string = "eth0 Link encap:Ethernet HWaddr 09:00:12:90:e3:e5 \n" + " inet addr:192.168.1.29 Bcast:192.168.1.255 Mask:255.255.255.0\n" + " inet6 addr: fe80::a00:27ff:fe70:e3f5/64 Scope:Link\n" + " UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1\n" + " RX packets:54071 errors:1 dropped:0 overruns:0 frame:0\n" + " TX packets:48515 errors:0 dropped:0 overruns:0 carrier:0\n" + " collisions:0 txqueuelen:1000 \n" + " RX bytes:22009423 (20.9 MiB) TX bytes:25690847 (24.5 MiB)\n" + " Interrupt:10 Base address:0xd020 \n" + "lo Link encap:Local Loopback \n" + " inet addr:127.0.0.1 Mask:255.0.0.0\n" + " inet6 addr: ::1/128 Scope:Host\n" + " UP LOOPBACK RUNNING MTU:16436 Metric:1\n" + " RX packets:83 errors:0 dropped:0 overruns:0 frame:0\n" + " TX packets:83 errors:0 dropped:0 overruns:0 carrier:0\n" + " collisions:0 txqueuelen:0 \n" + " RX bytes:7766 (7.5 KiB) TX bytes:7766 (7.5 KiB)\n" + "wlan0 Link encap:Ethernet HWaddr 58:a2:c2:93:27:36 \n" + " inet addr:192.168.1.64 Bcast:192.168.2.255 Mask:255.255.255.0\n" + " inet6 addr: fe80::6aa3:c4ff:fe93:4746/64 Scope:Link\n" + " UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1\n" + " RX packets:436968 errors:0 dropped:0 overruns:0 frame:0\n" + " TX packets:364103 errors:0 dropped:0 overruns:0 carrier:0\n" + " collisions:0 txqueuelen:1000 \n" + " RX bytes:115886055 (110.5 MiB) TX bytes:83286188 (79.4 MiB)"; 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