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kevinhooke/gist:8b6e990bf2f1a8a60ac7da598eaedbb2

Created September 16, 2019 23:46
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MacOS and Perl Compatible Regular Expressions (PCRE)
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gistfile1.txt
See https://www.unix.com/unix-for-advanced-and-expert-users/131088-grep-character-classes-w-d.html
Perl character classes like \w, \d are not supported by default in MacOS BSD style utils like grep, use POSIX classes
instead:
\w == [:alpha:]
[\w\d] == [:alnum:]
\d == [:digit:]
[\s\t] == [:blank:]
Also see: https://www.regular-expressions.info/posixbrackets.html
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