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From: | Lapo Luchini <lapo AT lapo DOT it> |
Subject: | Re: Limited regex support in newlib cripples syntax highlighting in nano |
Date: | Tue, 02 Sep 2008 08:17:45 +0200 |
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Reini Urban wrote: > 2008/8/1 Tomi Belan wrote as "Limited regex support in newlib cripples > syntax highlighting in nano" >> Cygwin regex.h implementation doesn't support some special sequences, >> for example \< (beginning of word), \> (end of word) and \b (word >> boundary). This causes a usability bug with the nano editor, which >> uses these sequences extensively in most of its syntax highlighting >> rules. > > Posix regex is much faster then perl-style pcre regex. Syntax > highlighter usually prefer fast over complete. So the term "crippled" > should be used with care. > > See e.g. http://swtch.com/~rsc/regexp/regexp1.html - Regular > Expression Matching Can Be Simple And Fast (but is slow in Java, Perl, > PHP, Python, Ruby, ...) - which complains about the typical POSIX > spencer implementation also. Interesting paper! Judging from the linked efficient implementations, it could be interesting to have TRE library <http://laurikari.net/tre/> in Cygwin. But judging from our own "man regexp" it should already have back-references (??): "Regexec is largely insensitive to RE complexity except that back references are massively expensive." -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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