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 = #"(?|([a-zA-Z0-9]+)[({[«]([a-zA-Z\s]+)[)}\]»]|[({[«]([a-zA-Z\s]+)[)}\]»]([a-zA-Z0-9]+))"# let regex = try! NSRegularExpression(pattern: pattern) let testString = #""" // i want to mark for single brackets examples below other heighlight pattren not disturb.please (weather // i want to mark this word weather) // i want to mark this word (weather is good // i want to mark this word weather is good) // i want to mark this word weathe)r wea(ther and same for other brackets {,[,« {weather // i want to mark this word weather} // i want to mark this word {weather is good // i want to mark this word weather is good} // i want to mark this word weathe}r // i want to mark this word weathe{r // i want to mark this word [weather // i want to mark this word weather] // i want to mark this word [weather is good // i want to mark this word weather is good] // i want to mark this word weathe]r // i want to mark this word weathe[r // i want to mark this word «weather // i want to mark this word weather} // i want to mark this word «weather is good // i want to mark this word weather is good» // i want to mark this word weathe»r // i want to mark this word weathe»r // i want to mark this word (Weather) is good. // not need to mark this beacuase this word correct word Weath(er) is good. // mark Weath(er is good). // mark Weather (is) (good). My name is Rah(eel) // mark Best pro(duct) // mark (Weather is good) // not need to mark this beacuase this word konown word we(ather) (weath)er is good. // mark (weath)er // mark weather(is fine) weather is good {weather is good} //not need to mark correct weat{er is good} // mark we{ather} is fine // mark {weathe}r is fine // i want to mark this word {weather is fin}e // i want to mark this word [weather is good] //not need to mark correct weat[her is good] // mark we[ather] is fine // mark [weathe]r is fine // mark [weather is f]ine // mark we[ather] is fine // mark «weather is good» //not need to mark weat«her is good» // mark we«ather» is fine // mark «weat»her is fine // mark «weather is fi»ne // mark """# 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