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 = "(^\\\"|\\{)"; final String string = "\"@odata.context\": \"https://example-app-env.aa01.aaa.aaaa-ad/odata/$metadata#Jobs\",\n" + " \"@odata.count\": 111,\n" + " \"value\": [\n" + " {\n" + " \"Key\": \"aaa1a111-aa11-11aa-a11a-11a1aa11a111\",\n" + " \"StartTime\": \"2023-01-20T14:08:34.607Z\",\n" + " \"EndTime\": \"2023-01-20T14:08:49.517Z\",\n" + " \"State\": \"Successful\",\n" + " \"JobPriority\": \"Normal\",\n" + " \"Source\": \"Agent\",\n" + " \"SourceType\": \"Agent\",\n" + " \"BatchExecutionKey\": \"aaa1a111-aa11-11aa-a11a-11a1aa11a111\",\n" + " \"Info\": \"Job completed\",\n" + " \"CreationTime\": \"2023-01-20T14:08:34.607Z\",\n" + " \"StartingScheduleId\": null,\n" + " \"ReleaseName\": \"RobotProdLogin_DEV\",\n" + " \"Type\": \"Attended\",\n" + " \"InputArguments\": \"\",\n" + " \"OutputArguments\": \"{}\",\n" + " \"HostMachineName\": \"AAAAAAAA11111\",\n" + " \"HasMediaRecorded\": false,\n" + " \"PersistenceId\": null,\n" + " \"ResumeVersion\": null,\n" + " \"StopStrategy\": null,\n" + " \"RuntimeType\": \"Development\",\n" + " \"RequiresUserInteraction\": true,\n" + " \"ReleaseVersionId\": 1111,\n" + " \"EntryPointPath\": null,\n" + " \"OrganizationUnitId\": 1,\n" + " \"OrganizationUnitFullyQualifiedName\": \"Default\",\n" + " \"Reference\": \"\",\n" + " \"ProcessType\": \"Process\",\n" + " \"ProfilingOptions\": null,\n" + " \"ResumeOnSameContext\": false,\n" + " \"LocalSystemAccount\": \"AAAAAA01\\\\AAA11AA\",\n" + " \"OrchestratorUserIdentity\": null,\n" + " \"Id\": 00000\n" + " },\n" + " {\n" + " \"Key\": \"aaa1a111-aa11-11aa-a11a-11a1aa11a111\",\n" + " \"StartTime\": \"2023-01-20T14:08:34.607Z\",\n" + " \"EndTime\": \"2023-01-20T14:08:49.517Z\",\n" + " \"State\": \"Successful\",\n" + " \"JobPriority\": \"Normal\",\n" + " \"Source\": \"Agent\",\n" + " \"SourceType\": \"Agent\",\n" + " \"BatchExecutionKey\": \"aaa1a111-aa11-11aa-a11a-11a1aa11a111\",\n" + " \"Info\": \"Job completed\",\n" + " \"CreationTime\": \"2023-01-20T14:08:34.607Z\",\n" + " \"StartingScheduleId\": null,\n" + " \"ReleaseName\": \"RobotProdLogin_DEV\",\n" + " \"Type\": \"Attended\",\n" + " \"InputArguments\": \"\",\n" + " \"OutputArguments\": \"{}\",\n" + " \"HostMachineName\": \"AAAAAAAA11111\",\n" + " \"HasMediaRecorded\": false,\n" + " \"PersistenceId\": null,\n" + " \"ResumeVersion\": null,\n" + " \"StopStrategy\": null,\n" + " \"RuntimeType\": \"Development\",\n" + " \"RequiresUserInteraction\": true,\n" + " \"ReleaseVersionId\": 1111,\n" + " \"EntryPointPath\": null,\n" + " \"OrganizationUnitId\": 1,\n" + " \"OrganizationUnitFullyQualifiedName\": \"Default\",\n" + " \"Reference\": \"\",\n" + " \"ProcessType\": \"Process\",\n" + " \"ProfilingOptions\": null,\n" + " \"ResumeOnSameContext\": false,\n" + " \"LocalSystemAccount\": \"AAAAAA01\\\\AAA11AA\",\n" + " \"OrchestratorUserIdentity\": null,\n" + " \"Id\": 00000\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