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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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

import Foundation // WARNING: You included a flag that Swift doesn't support: X // When this flag is set, it causes any backslash in the pattern that is followed by a letter that has no special meaning to cause an error. // By default in Swift, a backslash followed by a letter with no special meaning will be treated as a literal. let pattern = ##""" #PostgreSQL v10+ (?<delimiter>; [;\s]*) #semicolon, followed by semicolons and spaces | '(?>[^']+|'')*' #String Constants | \b[Ee]'(?>[^\\']+|''|\\.)*' #String Constants With C-Style Escapes | (?<stringDollarTag>\$[a-zA-Z\d_]*\$) #Dollar-Quoted String [^$]*+ #speed improves .*? \k<stringDollarTag> | "(?>[^"]+|"")*" | #singe-line comment (?<singeLineComment>-- [^\r\n]*+) | #multi-line comment (?<MutilineComment> /\* [^*/]*+ (?> [^*/]++ | \*[^/] | /[^*] | (?&MutilineComment) )*+ \*/ ) """## let regex = try! NSRegularExpression(pattern: pattern, options: [.allowCommentsAndWhitespace, .dotMatchesLineSeparators]) let testString = #""" CREATE UNIQUE INDEX/*CONCUR- RENTLY;*/IF NOT EXISTS custom_query_group_name_name_uindex ON public.custom_query_group_name (lower(name)); ; ; --CREATE INDEX /*CONCURRENTLY;*/ IF NOT EXISTS custom_query_group_name_name_trigram_index ON public.custom_query_group_name USING GIN (lower(name) gin_trgm_ops); ; ; ; CREATE INDEX /*CONCURRENTLY*/ IF NOT EXISTS v3_company_name_trigram_index ON public.v3_company USING GIN (lower(name) gin_trgm_ops); ; -- PostgreSQL $function$ BEGIN RETURN ($1 ~ $q$[\t\r\n\v\\]$q$); END; $function$; -- PostgreSQL SELECT $$Жанна д'Арк$$, $SomeTag$Жанна д'Арк$SomeTag$; SELECT 'abc\''\\def', "abc\""\\def"; SELECT 123; """# let stringRange = NSRange(location: 0, length: testString.utf16.count) let substitutionString = #"$0"# let result = regex.stringByReplacingMatches(in: testString, range: stringRange, withTemplate: substitutionString) 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