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

r"
"
gm

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"<img\s+[\S\"'= ]{0,40}src=[\"'](?P<src>(http(s)?:)?\/\/[^\":>]+)[\"']?"# let regex = try! NSRegularExpression(pattern: pattern, options: .anchorsMatchLines) let testString = ##""" <!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <meta name="referrer" content="always" /> <title>博客园 - 代码改变世界</title> <meta name="keywords" content="开发者,博客园,开发者,程序猿,程序媛,极客,编程,代码,开源,IT网站,Developer,Programmer,Coder,Geek,技术社区" /> <meta name="description" content="博客园是一个面向开发者的知识分享社区。自创建以来，博客园一直致力并专注于为开发者打造一个纯净的技术交流社区，推动并帮助开发者通过互联网分享知识，从而让更多开发者从中受益。博客园的使命是帮助开发者用代码改变世界。" /> <link rel="shortcut icon" href="//common.cnblogs.com/favicon.ico" type="image/x-icon" /> <link rel="Stylesheet" type="text/css" href="/bundles/aggsite.css?v=IlEZk4Ic2eCzcO6r0s4bGm62FAo8VZI-US_0EqUe2Bk1" /> <link id="RSSLink" title="RSS" type="application/rss+xml" rel="alternate" href="http://feed.cnblogs.com/blog/sitehome/rss" /> <script src="//common.cnblogs.com/scripts/jquery-2.2.0.min.js" type="text/javascript"></script> <script 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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