Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

r"
"
gms

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"^([a-zA-Z]+)\s*\{(.*?)}(?=\n[a-zA-Z]+\s*{\n|\Z)"# let regex = try! NSRegularExpression(pattern: pattern, options: [.anchorsMatchLines, .dotMatchesLineSeparators]) let testString = #""" BackdropNode { inputs 0 name BackdropNode6 tile_color 0x555555ff label RDN note_font_size 42 xpos -1136 ypos -4272 bdwidth 451 bdheight 529 } Write { file "\[value project_directory]/_output_/\[string range \[file tail \[value root.name]] 0 20].mov" colorspace sRGB raw true file_type mov\{(.*?)\} mov64_format "mov (QuickTime / MOV)" mov64_codec AVdh mov64_dnxhd_codec_profile "DNxHD 422 8-bit 145Mbit" mov64_dnxhr_codec_profile "SQ 4:2:2 8-bit" mov64_pixel_format {{0} "yuv420p\tYCbCr 4:2:0 8-bit"} mov64_quality High mov64_advanced 1 mov64_write_timecode true mov64_gop_size 12 mov64_b_frames 0 mov64_bitrate 20000 mov64_bitrate_tolerance 40000000 mov64_quality_min 2 mov64_quality_max 31 render_order 3 checkHashOnRead false version 132 in_colorspace scene_linear out_colorspace scene_linear name Write2 xpos -1025 ypos 2230 } """# 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