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 Foundation let pattern = #""bitrate":\d+,"width":(\d+),"height":(\d+)"# let regex = try! NSRegularExpression(pattern: pattern) let testString = #","mimeType":"video/mp4;+codecs=\"avc1.42001E,+mp4a.40.2\"","bitrate":353051,"width":640,"height":320,"lastModified":"1543659519195688","contentLength":"24469560","quality":"medium","fps":24,"qualityLabel":"360p","projectionType":"RECTANGULAR","averageBitrate":35300;codecs=\"avc1.64001F,+mp4a.40.2\"","bitrate":987359,"width":1280,"height":640,"lastModified":"1543660211977003","quality":"hd720","fps":24,"qualityLabel":"720p","projectionType":"RECTANGULAR2SzYpZXq8116S_3OkA","width":336,"height":188},{"url":"https://i.ytimg.com/vi/ddsd/maxresdefault.jpg","width":1920,"height":1080}]},"videoDuration":{"simpleText":"14:03"},"left":0.40175438,"width":0.32280701,"top":0.32554516,"aspectRatio":1.7777778,"startMs":"535093","endMs":"555093","title":{"accessibility":{"accessibilityData""# 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