replace '[:blank:]' pattern with ' \t'
replace '[:alnum:]' pattern with 'a-zA-Z0-9'
replace '[:alpha:]' pattern with 'a-zA-Z'
replace '[[:digit:]]' pattern with '\d'
define constants for regexp character classes
Merge pull request #2 from mojavelinux/pr-668-review

Use constants for regexp character classes
flatten any_list regexp to single line
Merge pull request #668 from Mogztter/opal-regexp