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hachi id:hachi

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2019.04.19 ã¯ã˜ã‚ã¦ã®æ£è¦è¡¨ç¾ã¨ãƒ™ã‚¹ãƒˆãƒ—ãƒ©ã‚¯ãƒ†ã‚£ã‚¹#9: `.*`ã‚„`.+`ãŒãƒãƒƒã‚¯ãƒˆãƒ©ãƒƒã‚¯ã§ä¸åˆ©ãªç†ç”± 1: åŸºæœ¬ã¨ãªã‚‹8ã¤ã®æ£è¦è¡¨ç¾ 2: æ£è¦è¡¨ç¾ã¨ã¯ä½•ã‹/ãƒ¯ã‚¤ãƒ«ãƒ‰ã‚«ãƒ¼ãƒ‰ã¨ã®é•ã„ 3: å†’é /æœ«å°¾ã«ãƒžãƒƒãƒã™ã‚‹ãƒ¡ã‚¿æ–‡å—ã¨ã‚»ã‚ãƒ¥ãƒªãƒ†ã‚£ã€æ–‡å—ã‚»ãƒƒãƒˆã®å¦å®šã¨ç¯„å›² 4: å…ˆèªã¿ã¨å¾Œèªã¿ã‚’æ¥µã‚ã‚‹ 5ï¼ˆç‰¹åˆ¥ç·¨ï¼‰|ã¨éƒ¨åˆ†ãƒžãƒƒãƒã®ãƒ¯ãƒŠ 6: æ–‡å—ã‚»ãƒƒãƒˆã®ã‚·ãƒ§ãƒ¼ãƒˆãƒãƒ³ãƒ‰ 7: Unicodeæ–‡å—ãƒã‚¤ãƒ³ãƒˆã¨Unicodeæ–‡å—ã‚¯ãƒ©ã‚¹ 8: å¯¾è±¡ã®æ§‹é€ ã‚’æ„è˜ã—ãŸã€Œé©åº¦ã«DRYãªã€æ›¸ãæ–¹ 9: .*ã‚„.+ãŒãƒãƒƒã‚¯ãƒˆãƒ©ãƒƒã‚¯ã§ä¸åˆ©ãªç†ç”±ï¼ˆæœ¬è¨˜äº‹ï¼‰ 10: å±é™ºãªã€ŒCatastrophic Backtrackingã€å‰ç·¨ ä¸»ã«Rubyã‚’ä¸å¿ƒã¨ã—ãªãŒã‚‰ã‚‚ã€ãªã‚‹ã¹ãä¸€èˆ¬çš„ãªå½¢ã§æ£è¦è¡¨ç¾ã‚’è§£èª¬ã—ã¦ã„ã¾ã™ã€‚èª¤ã‚Šã‚„ãŠæ°—ã¥ãã®ç‚¹ãŒã‚ã‚Šã¾ã—ãŸã‚‰@hachi8833ã¾ã§ã©ã†ãžðŸ™‡ã€‚ âš“.*ã®ãƒãƒƒã‚¯ãƒˆãƒ©ãƒƒã‚¯ã‚’è¦–è¦šçš„ã«ç†è§£ã™ã‚‹
hachi 2019/04/19
techracho

regexp
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hachi 2017/12/27
techracho

regexp

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hachi 2017/11/07
techracho

javascript

regexp

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hachi 2017/04/12
techracho

regexp

lookahead

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hachi 2017/04/10
techracho

ruby

rails

codingstyle

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regexp
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2017.03.27 ã€ç¶šãã€‘Ruby 2.4.1ã®OnigmoéžåŒ…å«æ¼”ç®—åã‚’ã‚ãˆã¦å˜ç‹¬ã§`#match?`ã§ä½¿ã£ã¦ã¿ãŸ ã“ã‚“ã«ã¡ã¯ã€hachi8833ã§ã™ã€‚å…ˆé€±ã®TechRachoè¨˜äº‹ã€ŒRuby 2.4.1æ–°æ©Ÿèƒ½: Onigmoæ£è¦è¡¨ç¾ã®éžåŒ…å«æ¼”ç®—å(?~ )ã‚’ãƒã‚§ãƒƒã‚¯ã€ã®ç¶šç·¨ã§ã™ã€‚ ã“ã“ã§è¡Œã£ã¦ã„ã‚‹éžåŒ…å«æ¼”ç®—åã®å˜ç‹¬åˆ©ç”¨ã¯æŒ™å‹•ã‚’ç†è§£ã™ã‚‹ãŸã‚ã®æ¥µç«¯ãªã‚±ãƒ¼ã‚¹ã§ã‚ã‚Šã€å®Ÿç”¨çš„ãªæ„å‘³ã¯ã‚ã‚Šã¾ã›ã‚“ã®ã§ã”äº†æ‰¿ãã ã•ã„ã€‚ éžåŒ…å«æ¼”ç®—åã®æŒ™å‹• ã€ŒRuby 2.4.1æ–°æ©Ÿèƒ½: Onigmoæ£è¦è¡¨ç¾ã®éžåŒ…å«æ¼”ç®—å(?~ )ã‚’ãƒã‚§ãƒƒã‚¯ã€è¨˜äº‹ã‚’ä½œæˆä¸ã«ä»¥ä¸‹ã®ã‚µãƒ³ãƒ—ãƒ«ã‚³ãƒ¼ãƒ‰ã‚’è¦‹ã¦ã„ã¦ã€ãµã¨æ°—ã«ãªã£ãŸç‚¹ãŒã‚ã‚Šã¾ã—ãŸã€‚ "ã†ã‚‰ã«ã¯ã«ã‚ã«ã‚ã«ã¯ã«ã‚ã«ã‚ã¨ã‚ŠãŒã„ã‚‹".match?(/(?~ã§ã‚‚)/) #=> true "ã†ã‚‰ã«ã¯ã«ã‚ã«ã‚ã«ã¯ã«ã‚ã«ã‚ã¨ã‚ŠãŒã„ã‚‹".match?(/(?~ã«ã¯)/) #=> true ç©ºæ–‡å—åˆ—
hachi 2017/03/27
techracho

ruby

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regexp

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2017.03.23 Ruby 2.4.1æ–°æ©Ÿèƒ½: Onigmoæ£è¦è¡¨ç¾ã®éžåŒ…å«æ¼”ç®—å(?~ )ã‚’ãƒã‚§ãƒƒã‚¯ ã“ã‚“ã«ã¡ã¯ã€hachi8833ã§ã™ã€‚Ruby 2.4.1ãƒªãƒªãƒ¼ã‚¹ãŠã‚ã§ã¨ã†ã”ã–ã„ã¾ã™ã€‚ å¤šãã®ä¿®æ£ãƒ»å¤‰æ›´ç‚¹ã®ä¸ã‹ã‚‰ã€ç§ã«ã¨ã£ã¦é–¢å¿ƒã®é«˜ã„éžåŒ…å«æ¼”ç®—åã‚’å–ã‚Šæ€¥ãŽãƒã‚§ãƒƒã‚¯ã—ã¦ã¿ã¾ã—ãŸã€‚çµæ§‹å¥¥ãŒæ·±ãã†ãªã®ã§ã€ä½•ã‹ã‚ã‹ã£ãŸã‚‰åˆ¥é€”è¨˜äº‹ã«ã™ã‚‹ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ã€‚ ã€Œç‰¹å®šã®æ–‡å—åˆ—ã‚’å«ã¾ãªã„æ–‡å—åˆ—ã«ãƒžãƒƒãƒã™ã‚‹ã€ãªã‚“ã¦å¤¢ã®ã‚ˆã†ã˜ã‚ƒã‚ã‚Šã¾ã›ã‚“ã‹ã€‚ å‚è€ƒæƒ…å ± å…¬å¼ãƒ‹ãƒ¥ãƒ¼ã‚¹: Ruby 2.4.1 Released 2.4.0ä»¥é™ã®ã‚³ãƒŸãƒƒãƒˆ: Comparing changes å…¬å¼ã®ã‚³ãƒŸãƒƒãƒˆã¯mergeã°ã‹ã‚Šä¸¦ã‚“ã§ã„ã¦èªã¿ã¥ã‚‰ã„ã®ã§ã€RubyFlowã®é€Ÿå ±ã‚‚å‚ç…§ã—ã¾ã—ãŸã€‚ Ruby 2.4.1 Onigmoã‚¢ãƒƒãƒ—ãƒ‡ãƒ¼ãƒˆã§éžåŒ…å«æ¼”ç®—åãŒå°Žå…¥ Rubyã®æ£è¦è¡¨ç¾ã‚¨ãƒ³ã‚¸ãƒ³ã¨ã—ã¦ãŠãªã˜ã¿ã®Onigmoã¯Rubyã¨ã¯ç‹¬
hachi 2017/03/23
techracho

ruby

regexp

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onigmo
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