Regular Expression Matching with a Trigram Index or How Google Code Search Worked
Regular Expression Matching with a Trigram Index or How Google Code Search Worked Russ Cox rsc@swtch.com January 2012 Introduction In the summer of 2006, I was lucky enough to be an intern at Google. At the time, Google had an internal tool called gsearch that acted as if it ran grep over all the files in the Google source tree and printed the results. Of course, that implementation would be fairl
正規表現を解析して可視化してくれるサイトが凄すぎる件
ある正規表現に対して、特定の文字列がマッチするかどうかをチェックするツールやサイトは沢山ありますが、正規表現そのものが何を意味しているのか、どんな文字列を期待しているのかを解析・解読・説明してくれるツールやサイトってなかなか見ない気がします。 他人の書いた正規表現を見て、「ん？」ってなったことはありませんか？ 例えばこれ。 1 ^[a-zA-Z0-9-_.]@([a-zA-Z0-9_-]+\.)+[a-zA-Z]{2,4}$ これくらいなら分かりますが、複雑になってくるとつらい… いつかはマスターしたいけど…今は楽したい。 そう思ってググってみると…ありました！ それがこちら。 Regexper http://www.regexper.com/ 正規表現を入力して Display をクリックすると、その正規表現が表す内容を図にして表示してくれます。 例えば先程の正規表現は、当記事の一番上の
RegExr: Learn, Build, & Test RegEx
RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp). Supports JavaScript & PHP/PCRE RegEx. Results update in real-time as you type. Roll over a match or expression for details. Validate patterns with suites of Tests. Save & share expressions with others. Use Tools to explore your results. Full RegEx Reference with help & examples. Undo & Redo with {{getCtrlKey()}}
PyRegex
\ escape special characters . matches any character ^ matches beginning of string $ matches end of string [5b-d] matches any chars '5', 'b', 'c' or 'd' [^a-c6] matches any char except 'a', 'b', 'c' or '6' R|S matches either regex R or regex S () creates a capture group and indicates precedence * 0 or more (append ? for non-greedy) + 1 or more (append ? for non-greedy) ? 0 or 1 (append ? for non-gr
Stop writing Regular Expressions. Express them with Verbal Expressions.
GitHub user jehna has fashioned a runaway hit with his unique way of constructing difficult regular expressions. VerbalExpressions turns the often-obscure-and-tricky-to-type regular expression operators into descriptive, chainable functions. The result of this is quite astounding. Here’s the example URL tester from the README: var tester = VerEx() .startOfLine() .then( "http" ) .maybe( "s" ) .then
JavaScript Regex :: XRegExp
More regex stuff by me: • Awesome Regex List of the best regex resources • regex Modern JS regex template tag “Regular Expressions Cookbook manages to be simultaneously accessible and almost ridiculously comprehensive.” —Jeff Atwood Get releases or the latest development build at GitHub. Check out regex, the lightweight and modern spiritual successor to XRegExp that once again takes JavaScript reg
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Regex Tester and Debugger Online - Javascript, PCRE, PHP
Regex Tester is a tool to learn, build, & test Regular Expressions (RegEx / RegExp). Results update in real-time as you type. Roll over a match or expression for details. Save & share expressions with others. Explore the Library for help & examples. Undo & Redo with {{getCtrlKey()}}-Z / Y. Search for & rate Community patterns.
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