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 = "activity\\\"\\s+:\\s+\\{\\s+(?<ACTIVITY_FIELDS>.*)\\}\\s+\\}"; final String string = "\"parts\" : [ { \"Mfg\" : \"SLF347\", \"Description\" : \"OP SYS\", \"quantity\" : 1, \"target\" : 0, \"Name\" : \"ACME\", \"quantityAT\" : 0, \"Mode\" : \"Manual\" }, { \"sku\" : \"8-45612-65423-0\", \"pDesc\" : \"INFOSERV\", \"quantity\" : 1, \"Name\" : \"ACME\", \"Mode\" : \"Manual\" } ], \"region\" : \"US\", \"scheduled\" : false, \"LevelEpoch\" : \"1570750199\", \"account\" : { \"channel\" : \"USPA\" }, \"activity\" : { \"dNumber\" : 718526123, \"build\" : 12, \"TimeZone\" : \"GMT-08:00\", \"description\" : \"Windows 10\", \"groupName\" : \"WestGroup\", \"id\" : \"A-2KJLSJRHE\", \"priority\" : \"Low\", \"reasonCode\" : \"GH5HTH\", \"recordType\" : \"Fix\", \"status\" : \"DCNR\", \"statusDescription\" : \"Def Request\", \"solution\" : \"Re-install\", \"AgencyRev\" : false, \"statusDateEpoch\" : \"1573715886\", \"rCount\" : 1, \"arrivalTimezone\" : \"GMT-06:00\", \"Start\" : 1569938400000, \"End\" : 1571097540000, \"Used\" : \"Y\", \"laborCode\" : \"Ackgd\", \"partCode\" : \"Ced\", \"note\" : \"Issue Description : Re-Install\", \"owner\" : { \"BU\" : 0, \"certFlag\" : false, \"name\" : \"John Doe\", \"Id\" : 0 }, \"environment\" : \"None\", \"subEnvironment\" : \"Other\", \"serialNumber\" : \"ADN0970234529387509237\", \"UID\" : \"B-4FJFLL\", \"DateEpoch\" : \"1569701589\", \"repeat\" : \"N\", \"servAtt\" : { \"ServiceType\" : \"Fix\", \"ServiceSubType\" : \"WH\", \"Billable\" : \"N\", \"CompleteUnit\" : \"N\", \"OutHour\" : \"N\", \"OutWarranty\" : \"N\", \"ServHour\" : \"365x24x7\", \"Level\" : \"10\", \"ProviderId\" : \"LEK\", \"ServpProvider\" : \"LEK\", \"System\" : \"Notebook\", \"Deferred\" : \"No\", \"Cover\" : \"5-10x5\", \"ScheduleFlag\" : \"N\", \"Component\" : \"N\" } }, \"address\" : { \"address\" : \"1 Main St\", \"address1\" : \"1 Main St\", \"city\" : \"Nowhere\", \"country\" : \"US\", \"postalCode\" : \"12345\", \"region\" : \"US\", \"state\" : \"ZZ\", \"timeZone\" : \"GMT-08:00\" }"; 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