Re: trim leading & trailing whitespace

s[^\s*(.*)\b\s*$][$1]

Update: Corion rightly points out that this does not work correctly for lines where the last non whitespace character is a non-words character. Eg.

    the quick brown fox (   \n
#                       ^
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So, use s[^\s*(.*\S)\s*$][]; instead. It's slower, but still quicker than the FAQ method.

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