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
Processing...

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 = "<PurposeOfUse csd-code=\\\"(?<ATNAPurposeOfUse>.+?)\\\""; final String string = "2677 <85>1 2021-01-20T11:59:04+00:00 localhost icw-chr 1436 IHE+RFC-3881 - <?xml version=\"1.0\" encoding=\"UTF-8\"?><AuditMessage><EventIdentification EventActionCode=\"R\" EventDateTime=\"2021-01-20T11:59:04.678Z\" EventOutcomeIndicator=\"8\"><EventID csd-code=\"110106\" codeSystemName=\"DCM\" originalText=\"Export\" /><EventTypeCode csd-code=\"ITI-43\" codeSystemName=\"IHE Transactions\" originalText=\"Retrieve Document Set\" /><PurposeOfUse csd-code=\"NORM\" codeSystemName=\"2.16.756.5.30.1.127.3.10.5\" originalText=\"Normal Access\" /></EventIdentification><ActiveParticipant UserID=\"https://api.test.xad.ch/pxs/webservices/xca/initiatingGateway/iti43RetrieveDocuments\" UserName=\"svrz1975.spital.so.ch\" UserIsRequestor=\"false\" NetworkAccessPointID=\"10.250.76.81\" NetworkAccessPointTypeCode=\"2\"><RoleIDCode csd-code=\"110153\" codeSystemName=\"DCM\" originalText=\"Source Role ID\" /></ActiveParticipant><ActiveParticipant UserID=\"&lt;7601003961638@xua.hin.ch&gt;\" UserName=\"&lt;7601003961638@xua.hin.ch&gt;\" UserIsRequestor=\"true\"><RoleIDCode csd-code=\"HCP\" codeSystemName=\"2.16.756.5.30.1.127.3.10.6\" originalText=\"Behandelnde(r)\" /></ActiveParticipant><ActiveParticipant UserID=\"7601003961638\" UserName=\"Marco Studer\" UserIsRequestor=\"true\"><RoleIDCode csd-code=\"HCP\" codeSystemName=\"2.16.756.5.30.1.127.3.10.6\" originalText=\"Behandelnde(r)\" /></ActiveParticipant><ActiveParticipant UserID=\"http://www.w3.org/2005/08/addressing/anonymous\" AlternativeUserID=\"1436\" UserIsRequestor=\"false\" NetworkAccessPointID=\"api.test.xad.ch\" NetworkAccessPointTypeCode=\"1\"><RoleIDCode csd-code=\"110152\" codeSystemName=\"DCM\" originalText=\"Destination Role ID\" /></ActiveParticipant><AuditSourceIdentification AuditEnterpriseSiteID=\"2.16.756.5.30.1.194\" AuditSourceID=\"t01-x-chrapp-1\"><AuditSourceTypeCode csd-code=\"9\" codeSystemName=\"DCM\" originalText=\"Other\" /></AuditSourceIdentification><ParticipantObjectIdentification ParticipantObjectID=\"761337610339478800^^^&amp;2.16.756.5.30.1.127.3.10.3&amp;ISO\" ParticipantObjectTypeCode=\"1\" ParticipantObjectTypeCodeRole=\"1\"><ParticipantObjectIDTypeCode csd-code=\"2\" codeSystemName=\"RFC-3881\" originalText=\"Patient Number\" /></ParticipantObjectIdentification><ParticipantObjectIdentification ParticipantObjectID=\"2.25.319915379891245844588550626280213087638\" ParticipantObjectTypeCode=\"2\" ParticipantObjectTypeCodeRole=\"3\"><ParticipantObjectIDTypeCode csd-code=\"9\" codeSystemName=\"RFC-3881\" originalText=\"Report Number\" /><ParticipantObjectDetail type=\"Repository Unique Id\" value=\"Mi4xNi43NTYuNS4zMC4xLjE5NC4zLjMuMg==\" /><ParticipantObjectDetail type=\"ihe:homeCommunityID\" value=\"dXJuOm9pZDoyLjE2Ljc1Ni41LjMwLjEuMTk0\" /></ParticipantObjectIdentification></AuditMessage>\n\n"; 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