__OUTPUT__ The regular expression: (?-imsx:.*([\$#%>~]|\@\w~\$|\\\[\\e\[0m\\\] \[0m)\s?) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- .* any character except \n (0 or more times (matching the most amount possible)) ---------------------------------------------------------------------- ( group and capture to \1: ---------------------------------------------------------------------- [\$#%>~] any character of: '\$', '#', '%', '>', '~' ---------------------------------------------------------------------- | OR ---------------------------------------------------------------------- \@ '@' ---------------------------------------------------------------------- \w word characters (a-z, A-Z, 0-9, _) ---------------------------------------------------------------------- ~ '~' ---------------------------------------------------------------------- \$ '$' ---------------------------------------------------------------------- | OR ---------------------------------------------------------------------- \\ '\' ---------------------------------------------------------------------- \[ '[' ---------------------------------------------------------------------- \\ '\' ---------------------------------------------------------------------- e 'e' ---------------------------------------------------------------------- \[ '[' ---------------------------------------------------------------------- 0m '0m' ---------------------------------------------------------------------- \\ '\' ---------------------------------------------------------------------- \] ']' ---------------------------------------------------------------------- ' ' ---------------------------------------------------------------------- \[ '[' ---------------------------------------------------------------------- 0m '0m' ---------------------------------------------------------------------- ) end of \1 ---------------------------------------------------------------------- \s? whitespace (\n, \r, \t, \f, and " ") (optional (matching the most amount possible)) ---------------------------------------------------------------------- ) end of grouping ----------------------------------------------------------------------