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PyConJP2014発表資料。 ・正規表現リテラルは、**あれば便利だけどなくても困らない**(ライブラリでカバーできる)ことを説明する。 ・Pythonの正規表現が抱える問題点とその解決案を紹介する。
\ 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
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()}}
This page has been moved from an old geocities to rescue it from a premature death. If you are the former maintainer of this content please contact us (we tried to contact you, honest) to let us know if you are interested in resume maintainence of this content or just to say Cheers! Vim is an improved (in many ways) version of vi, a ubiquitous text editor found on any UNIX system. VIM was created
RegExp は 正規表現(Regular Expression)の略。以下、参考サイト。 正規表現(RegExp)RegExp - MDC Doc CenterRegExp オブジェクトの中身は?RegExp オブジェクトのプロパティには 直前の マッチングに関する情報が入る。じゃあ何が入っているのか? //とりあえずなにもせずに調べてみる function dump( obj ){ var str = ''; for(var k in obj){ str += k + "("+typeof(obj[k]) + ") | " + obj[k] + "\n"; } document.write( str ); } dump( RegExp ); input(string) | message.Reload to activate window console multiline(boole
基本は最長マッチ、最短マッチさせたい時には?をつける >>> import re >>> a = "ABABABABAB" >>> re.search(r'(AB)+',a).group() 'ABABABABAB' >>> re.search(r'(AB)+?',a).group() 'AB' すぐに忘れるのでメモ
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正規表現の否定は\@!を使う。:help \@! 参照。ちなみにこれはzero-widthなマッチなのに注意。ふつうの否定とかないんですかね、まあいいけど。 例: バッファ内、 PATTERN にマッチしない行を REPLACEMENT で置き換える :%s/\(PATTERN\)\@!.*/REPLACEMENT/ 追記: :vコマンドを使う 上の例だと :%v/PATTERN/s/.*/REPLACEMENT/ :vの詳細は:help :vを熟読のこと。 :g!と等価のコマンドで、「指定したパターンにマッチしない各行に対して以下のコマンドを実行する」というコマンド。 thanks>mattn
Blogged by Ujihisa. Standard methods of programming and thoughts including Clojure, Vim, LLVM, Haskell, Ruby and Mathematics written by a Japanese programmer. github/ujihisa Most modern programming languages have regular expression engines. Here I'll compare the speed of each regular expression engines with long text matching which has backtracking. I used Ruby, Perl and Python for this examinatio
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What Is a Regular Expression? Regular expressions (also known as regex) are a concise and flexible way to search and replace within text strings. With a regular expression, you can easily match characters, words, or patterns within text. A really basic example would be the regex /c*t/—this would match "cat", "cot", or "cut", but not "pat" or "but". The regular expressions I'll show you today will
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