Some text matching questions

[Guest]

Line 1 checks for the beginning of a tag and sets a variable to "1" when the start of a tag is matched and empties the variable when an end of tag is matched.
It does not "instructs it not to match anything while the variable is set to '1'"

(<$SET(open=1)|>$SET(open=))PrxNeverMatch
or
(<$SET(open=1)PrxNeverMatch|>$SET(open=)PrxNeverMatch)

Line 5 is the parenthesis that starts the part that places things following "pink" into variable "1"

Line 7 requires pink(s|) to be followed by:
a space
a <
an 's
a character that is not a letter or digit.

Line 9 does not match when called while inside a tag.
(^$TST(open=1)) "NOT if open is 1".

For visual clarity. Seems to have worked.