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 = "^(?P<UserID>\\w*)\\|(?P<UserType>\\w*)\\|(?P<System>\\w*)\\|(?P<EventType>\\w*)\\|(?P<EventId>[^\\|]*)\\|(?P<Subject>[^\\|]*)\\|(?P<SID>[^\\|]*)\\|(?P<IPAddr>[^\\|]*)\\|(?P<EventStatus>[^\\|]*)\\|(?P<Msg>[^\\|]*)\\|(?P<TimeStamp>[^\\|]*)\\|(?P<DATA>[^\\|]*)\\|(?P<Period>[^\\|]*)\\|(?P<MCode>[^\\|]*)\\|(?P<Type>[^\\|]*)\\|(?P<Type2>[^\\|]*)\\|(?P<DeviceId>[^\\|]*)\\|(?P<DesIP>[^\\|]*)\\|(?P<Code>[^\\|]*)\\|(?P<Headers>.*)"; final String string = "TESTUser|TESTSYSTEM|DNSTEST|USERTEST|CREATE_SUPER_USER_GROUP|TEST_ELEMENT<GROUP_NAME_group3>|19e4e88e-7fb1-4309-b8a3-93180e41ef86|76.253.69.172|00||2022-04-14T23:59:33.059-0400|{dsUrn: testgroup:'da04c367-b41c-421a-85e1-d5ab759c0c82'}|NA|||||10.207.92.23|23|\n\n" + "TESTUser|TESTSYSTEM|DNSTEST|USER|VIS_EXPORT_EXCEL|TEST_ELEMENT<DNSTES_801482320>|ce01fdc2-2bbe-45ef-845b-f79576e215bf|65.144.148.136|00||2022-05-09T10:21:44.021-0400|{dsUrn: testgroup:'6f10e8f8-100b-4482-9b09-10e18504924c'}|NA|||||10.207.92.23|23|23as\n\n" + "TESTUser|TESTSYSTEM|DNSTEST|USERTEST|IMPERSONATE_USER|TEST_ELEMENT<USERNAME_TESTUser4>|c594626f-e6e9-4abd-9e0b-fa9861c47285|236.214.26.15|00||2022-05-10T07:52:48.052-0400|{dsUrn: testgroup:'DNS -3ac6-4e92-b50b-e903961f5894'}|NA|||||10.207.92.23|23|\n\n" + "TESTUser1TESTUser|TESTSYSTEM|DNSTEST|USER|VIS_SAVE|TEST_ELEMENT<UNVERIFIED_648656466>|5143518f-dc60-433b-a0cc-2fa024b25360|241.254.244.33|00||2022-05-02T05:01:58.001-0400|{dsUrn: testgroup:'157c4534-d970-4b7b-9181-1bddb8f7a670'}|NA|||||10.207.92.23|23|\n\n" + "|TESTSYSTEM|DNSTEST|USERTEST|ENABLE_USER|TEST_ELEMENT<USERNAME_TESTUser1>|2923b00c-0a95-465d-85aa-3af5387e992c|19.173.21.53|00||2022-05-29T12:13:26.013-0400|{dsUrn: 'DNS', groupId:'49de37d5-ea28-45ba-be52-84d933425636'}|NA|||||10.207.92.23|23|\n\n" + "TESTUser6|TESTSYSTEM|DNSTEST|USERTEST|ENABLE_USER|TEST_ELEMENT<USERNAME_TESTUser5>|0f1ba654-03bf-DNS-ac8f-8f5185232d42|245.236.181.176|00||2022-04-09T02:14:23.014-0400|{dsUrn: testgroup:'b6a89e91-ac03-4641-a3bc-166d013df252'}|NA|||||10.207.92.23|23|\n\n" + "TESTUser2|TESTSYSTEM|DNSTEST|USERTEST|UPDATE_TESTDATA|TEST_ELEMENT<USERNAME_TESTUser>|0acf2593-d7ee-4ba8-bf4e-29a4d4adcdaf|213.184.95.84|01|Failed to update TESTDATA. TESTDATA.|2022-03-12T08:03:19.003-0500|{dsUrn: 'gp', groupId:'9850940e-ff7b-4b77-820b-8d0472933c4a'}|NA|||||10.207.92.23|500|2w1\n\n" + "TESTUser|TESTSYSTEM|DNSTEST|USERTEST|CREATE_SUPER_USER_GROUP|TEST_ELEMENT<GROUP_NAME_group3>|9717a152-3809-416a-87a3-e9a4bc9b01a9|14.22.163.187|00||2022-03-19T10:34:35.034-0400|{dsUrn: 'DNSTEST', groupId:'cf9263ba-aff7-4e34-98c1-a09d17aaf8d6'}|NA|||||10.207.92.23|23|header12"; 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