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 = "Subject:\\n\\s+Security ID:[^\\n]+\\n\\s+Account Name:\\s+(?<account_creator>[^\\n]+)"; final String string = "6/6/19\n" + "9:27:22.000 AM \n" + "06/06/2019 09:27:22 AM\n" + "LogName=Security\n" + "SourceName=Microsoft Windows security auditing.\n" + "EventCode=4720\n" + "EventType=0\n" + "Type=Information\n" + "ComputerName=CPMASNAAD03.na.cintas.com\n" + "TaskCategory=User Account Management\n" + "OpCode=Info\n" + "RecordNumber=5472484169\n" + "Keywords=Audit Success\n" + "Message=A user account was created.\n\n" + "Subject:\n" + " Security ID: \"xxxxxxxxx\"\n" + " Account Name: Account Creator\n" + " Account Domain: xxxxx\n" + " Logon ID: xxxxxxx\n\n" + "New Account:\n" + " Security ID: \"xxxxxx\"\n" + " Account Name: Account Created\n" + " Account Domain: xxxxxxx\n\n" + "Attributes:\n" + " SAM Account Name: xxxxxxxx\n" + " Display Name: User\n" + " User Principal Name: -\n" + " Home Directory: -\n" + " Home Drive: -\n" + " Script Path: -\n" + " Profile Path: -\n" + " User Workstations: -\n" + " Password Last Set: <never>\n" + " Account Expires: <never>\n" + " Primary Group ID: 513\n" + " Allowed To Delegate To: -\n" + " Old UAC Value: 0x0\n" + " New UAC Value: 0x11\n" + " User Account Control: \n" + " Account Disabled\n" + " 'Normal Account' - Enabled\n" + " User Parameters: -\n" + " SID History: -\n" + " Logon Hours: <value not set>\n\n" + "Additional Information:\n" + " Privileges"; 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