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 Foundation let pattern = #"activity\"\s+:\s+\{\s+(?<ACTIVITY_FIELDS>.*)\}\s+\}"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = #""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" }"# let stringRange = NSRange(location: 0, length: testString.utf16.count) let matches = regex.matches(in: testString, range: stringRange) var result: [[String]] = [] for match in matches { var groups: [String] = [] for rangeIndex in 1 ..< match.numberOfRanges { let nsRange = match.range(at: rangeIndex) guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue } let string = (testString as NSString).substring(with: nsRange) groups.append(string) } if !groups.isEmpty { result.append(groups) } } print(result)

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 Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression