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

/
/
g

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 = "Number\\:\\s(?<Number>\\d+)[\\r\\n]Category\\:\\s(?<Category>.*).*[\\r\\n].*[\\r\\n].*[\\r\\n]What\\sis\\sthe\\sspecific\\srole\\sor\\sfunction\\sof\\sthis\\sserver\\?\\:\\s(?<Function>.*).*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n]Server\\sHostname\\:\\s(?<Hostname>.*).*[\\r\\n]Server\\sAllegiance\\:\\s(?<Domain>.*).*[\\r\\n].*[\\r\\n]Physical\\sLocation\\:\\s(?<Location>.*).*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n].*[\\r\\n]Local\\sAdministrators\\:\\s+([\\w\\s]+)[\\r\\n].*[\\r\\n].*[\\r\\n]Task\\sDescription\\:\\s(?<Task>.*)"; final String string = "Task # 12347859 has been opened and assigned to XXXXXXX - . \n" + "Task # 12347859\n" + "Client Details\n" + "Jackie Newman\n" + "servicedesk@thenet.com\n\n" + "Assignment Details\n" + "User course@email.com\n\n" + "Status and Priority Details\n" + "Urgency: 4-LOW\n" + "Impact: 4-MINOR\n" + "Status: Assigned\n" + "Task Details\n" + "Number: 12347859\n" + "Category: Add/Upgrade Server Software \n" + "Application: Production Web Server\n" + "Linked Record: CR123458756 - 2-Implementation\n" + "What is the specific role or function of this server?: XXXXXXXXXXXX\n" + "What is the primary application for this server deployment?: XXXXXXXXXXXXX\n" + "Provide a detailed description that explains the function or role of the server.: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n" + "It will also be used as a proxy Card Recon scan server to scan application databases\n" + "Is this replacing an existing server?: Si\n" + "Please explain when will the old server be decommissioned?: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n" + "Is this a physical or virtual server?: XXXXXXXXX\n" + "What is the required Operating System?: XXXXXXXXX\n" + "Patching Schedule: XXXXXXXXX\n" + "Environment - Is the server Production, Development or Disaster Recovery?: XXXXXXXXX\n" + "Server Hostname: XXXXXXXXX\n" + "Server Allegiance: XXXXXXXXX\n" + "Will SQL Server be required on this server?: XXX\n" + "Physical Location: XXXXXXXXX\n" + "Include in Enterprise Backups?: XX\n" + "Resource Requirements: RAM: XXXX\n" + "Resource Requirements: CPUs: XX\n" + "Resource Requirements: Disk [Quantity and Size(s)]: 40GB\n" + "Local Administrators: XXXXXXXXX\n" + "XXXXXXXXX\n" + "XXXXXXXXX\n" + "XXXXXXXXX\n" + "Directories to be excluded from Anti-Virus scanning: None\n" + "Additional Comments:\n" + "Task Description: XXXXXXXXX\n"; final Pattern pattern = Pattern.compile(regex); 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