A blog for programmer
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Born in Tomakomai city - [DEPRECATED]æ£è¦è¡¨ç¾æŠ€è¡“入門ã¯è¨ˆç®—æ©Ÿã‚’æ„›ã™ã‚‹ã™ã¹ã¦ã®äººãŒèªã‚€ã¹ã本
A blog for programmer
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Regular Expression Matching Can Be Simple And Fast
Regular Expression Matching Can Be Simple And Fast (but is slow in Java, Perl, PHP, Python, Ruby, ...) Russ Cox [email protected] January 2007 Introduction This is a tale of two approaches to regular expression matching. One of them is in widespread use in the standard interpreters for many languages, including Perl. The other is used only in a few places, notably most implementations of awk and grep.
JavaScriptã®æ£è¦è¡¨ç¾ã§æ–‡å—列を抜ã出ã™ã€Œã‚°ãƒ«ãƒ¼ãƒ—化ã€
JavaScriptã®æ£è¦è¡¨ç¾ã§ç‰¹å®šã®æ–‡å—列を抜ã出ã™ã€Œã‚°ãƒ«ãƒ¼ãƒ—化ã€ã«ã¤ã„ã¦è§£èª¬ã—ã¾ã™ã€‚ JavaScriptã§ç‰¹å®šã®æ–‡å—列を抜ã出ã—ã¦å‡¦ç†ã—ãŸã„ã“ã¨ãŒã‚ˆãã‚ã‚‹ã®ã§ã™ãŒã€ã‚°ãƒ«ãƒ¼ãƒ—化ã®ä½¿ã„方を忘れã¦ãƒãƒƒãƒˆã§æ¤œç´¢ã—ã¦ã‚‚ãªã‹ãªã‹ãƒ’ットã—ãªã„ã®ã§ã€å‚™å¿˜éŒ²ã§æ®‹ã—ã¦ãŠãã¾ã™ï¼ˆä»–ã«é©åˆ‡ãªæ–¹æ³•ãŒã‚るよã†ã§ã—ãŸã‚‰ã™ã„ã¾ã›ã‚“）。 １．特定ã®æ–‡å—列を抜ã出㙠ã¾ãšåŸºæœ¬ã¨ã—ã¦ã€ç‰¹å®šã®å›ºå®šæ–‡å—列を抜ã出ã™ã«ã¯ã€match関数ã§æ¬¡ã®ã‚ˆã†ã«è¨˜è¿°ã—ã¾ã™ã€‚ var foo = 'abcdefg'; var bar = foo.match(/abc/); ã“ã‚Œã¯å¤‰æ•°fooã«ã€Œabcã€ã¨ã„ã†æ–‡å—ãŒå«ã¾ã‚Œã¦ã„ã‚Œã°ã€å¤‰æ•°barã« abc ãŒè¨å®šã•ã‚Œã¾ã™ã€‚ 変数fooã«ã€Œabcã€ã¨ã„ã†æ–‡å—ãŒå«ã¾ã‚Œã¦ã„ãªã„å ´åˆã€å¤‰æ•°barã«nullãŒè¨å®šã•ã‚Œã¾ã™ã€‚ ã“ã®ä½¿ã„æ–¹ã¯ã€æ¤œç´¢ã—ãŸã„æ–‡å—列ãŒã‚らã‹ã˜ã‚決ã¾ã£ã¦ã„ã¦ã€ä¸Šè¨˜ã®ã‚ˆã†ãªä»£å…¥æ–‡ã§ã¯ãªãã€åˆ¤
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