Regular Expressions
The code does not come with any warranties, explicit or implied. Problem: We have a file (or a set of files) and we want to search for all email IDs present within those files. The email IDs may be embedded within sentences and may be found anywhere in the file. We have a set of rules that specify what constitutes a valid email ID. As we shall see, the solution we will discover will be quite gener
Tom White's Blog: A Faster Java Regex Package
Posted by tomwhite on March 27, 2006 at 12:02 PM | Comments (4) Anders Møller's dk.brics.automaton is a Java regex package whose main claim to fame is that it is significantly faster then all other Java regex libraries, including the java.util.regex classes in the JDK. Like many things in computer science, the speed gains come at a price. In this case, the regular expression language supported is
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SUNã®æ¨™æº–ã®æ£è¦è¡¨ç¾ãƒ©ã‚¤ãƒ–ラリã§ã‚ã‚‹java.util.regexパッケージã«ã¤ã„ã¦èª¿ã¹ã¦ã¿ãŸã€‚java.util.regexã¯éžæ±ºå®šæ€§æœ‰é™ã‚ªãƒ¼ãƒˆãƒžãƒˆãƒ³(NFA)ã«åŸºã¥ã（Javaã«ã¯å¤šæ•°ã®æ£è¦è¡¨ç¾ãƒ‘ッケージãŒã‚ã‚‹ãŒæ±ºå®šæ€§æœ‰é™ã‚ªãƒ¼ãƒˆãƒžãƒˆãƒ³(DFA)を用ã„ãŸå®Ÿè£…ã¯ãªã„らã—ã„）。 ã„ããªã‚Šã§ã™ãŒã€ã“ã“ã§å•é¡Œã§ã™ã€‚次ã®Javaã®å¼ã®å€¤ã¯ä½•ã§ã—ょã†ï¼ˆã¡ã‚‡ã£ã¨å¼•ã£æŽ›ã‘ã‹ã‚‚。ヒントã¯ã‚µãƒã‚²ãƒ¼ãƒˆãƒšã‚¢ï¼‰ã€‚ "\uD835\uDD21".matches(".*[\\uD834\\uDD21]+.*") ã¡ã‚‡ã£ã¨ã„やらã—ã„例ã ã£ãŸã®ã§ã€ã‚‚ã£ã¨ç´ ç›´ãªä¾‹ã‚’。以下ã®Javaã®å¼ã®å€¤ã¯ä½•ã‹(String#matchesã¯å…¨ä½“一致ã§ã‚る事ã«æ³¨æ„) "\uD834\uDD21".matches(".") 解説ã€\uD834\uDD21 㯠Java ã® Unicode エスケープã§ã‚³ãƒ¼ãƒ‰ãƒã‚¤ãƒ³ãƒˆ U+1D121（一文å—
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.
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