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Regexp syntax for "not a word or a symbol constituent"?

From: Dmitry Gutov
Subject: Regexp syntax for "not a word or a symbol constituent"?
Date: Wed, 13 Apr 2016 00:25:24 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0
The best one I can think of is "\\s-\\|\\s.\\|\\s(\\|\\s)\\|\\s\"\\|\\s\\\\|\\s/\\|\\s$\\|\\s'\\|\\s<\\|\\s>\\|\\s!\\|\\s|", but that's quite long and somewhat less efficient than it could be (e.g. compared to \_< and \_>).
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