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 = #"\"ruleGroupId\":\s*\"(?<ruleGroupId>[^\"]+)\",[\r\n](.+[\r\n]){2}(\"excludedRules\"\:\s\[)([\r\n].+)[\r\n]\"exclusionType\"\:\s*\"(?<exclusionTpe>[^\"]+)"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = ##""" { "timestamp": 1646229254523, "formatVersion": 1, "webaclId": "arn:aws:wafv2:us-east-1:111111:regional/webacl/alb-stage-web-acl/26ac170c-03c4-4fd7-8fab-86e346789fef", "terminatingRuleId": "Default_Action", "terminatingRuleType": "REGULAR", "action": "ALLOW", "terminatingRuleMatchDetails": [], "httpSourceName": "ALB", "httpSourceId": "182116744736-app/ALB-Stage/fcc1f5f9483b035e", "ruleGroupList": [ { "ruleGroupId": "AWS#AWSManagedRulesAmazonIpReputationList", "terminatingRule": null, "nonTerminatingMatchingRules": [], "excludedRules": null }, { "ruleGroupId": "AWS#AWSManagedRulesBotControlRuleSet", "terminatingRule": null, "nonTerminatingMatchingRules": [], "excludedRules": null }, { "ruleGroupId": "AWS#AWSManagedRulesCommonRuleSet", "terminatingRule": null, "nonTerminatingMatchingRules": [], "excludedRules": [ { "exclusionType": "EXCLUDED_AS_COUNT", "ruleId": "SizeRestrictions_BODY" } ] }, { "ruleGroupId": "AWS#AWSManagedRulesKnownBadInputsRuleSet", "terminatingRule": null, "nonTerminatingMatchingRules": [], "excludedRules": null } ], "rateBasedRuleList": [], "nonTerminatingMatchingRules": [], "requestHeadersInserted": null, "responseCodeSent": null, "httpRequest": { "clientIp": "67.218.14.10", "country": "US", "headers": [ { "name": "host", "value": "sample.com" }, { "name": "content-length", "value": "50362" }, { "name": "cache-control", "value": "max-age=0" }, { "name": "sec-ch-ua", "value": "\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"98\", \"Microsoft Edge\";v=\"98\"" }, { "name": "sec-ch-ua-mobile", "value": "?0" }, { "name": "sec-ch-ua-platform", "value": "\"Windows\"" }, { "name": "origin", "value": "https://sample.com" }, { "name": "upgrade-insecure-requests", "value": "1" }, { "name": "dnt", "value": "1" }, { "name": "content-type", "value": "multipart/form-data; boundary=----WebKitFormBoundaryuXOFvh7iQjJkEJHm" }, { "name": "user-agent", "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36 Edg/98.0.1108.62" }, { "name": "accept", "value": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9" }, { "name": "sec-fetch-site", "value": "same-origin" }, { "name": "sec-fetch-mode", "value": "navigate" }, { "name": "sec-fetch-user", "value": "?1" }, { "name": "sec-fetch-dest", "value": "document" }, { "name": "referer", "value": "https://sample.com/DischargeDetail.aspx" }, { "name": "accept-encoding", "value": "gzip, deflate, br" }, { "name": "accept-language", "value": "en-US,en;q=0.9" }, { "name": "cookie", "value": "_ga=GA1.3.84334902.1642521795; __RequestVerificationToken=-8kinKddCjKCZTws-wPmXDZTFg39urggswPnYm5Y15UwfIjspHqTj1hOPAXIaRPHL2cupyt2vO4Gb5QUExZGd6e5djS0v81kxt2pH22Ow9XiJYr2NPWB_BdQb-VmCUHVXbiVZZ5NwTfGDrXd2O0uD_gba4fM3PhkQUO5f9zs5381; _gid=GA1.2.249665053.1645964709; _ga_33R15ZN4N1=GS1.1.1645965393.6.0.1645965397.56; _ga=GA1.2.84334902.1642521795; ASP.NET_SessionId=1fnikipv2poi14r3doy4kb2w" } ], "uri": "/ReleaseRequest.aspx", "args": "", "httpVersion": "HTTP/2.0", "httpMethod": "POST", "requestId": "1-621f7706-5e8f4ea33e2dc0cc66b98797" } } """## 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