1. OP didn't say anything about linefeeds so it's safe to assume they can be ignored
  2. OP didn't say that "_" is not allowed. It's "alphanumeric characters with underscores, one or more"
  3. OP's post is poorly written so expect a poorly written reply ;)
s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In reply to Re^3: Looking for a regular expression for the following pattern. by Skeeve
in thread Looking for a regular expression for the following pattern. by skooma

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