|Perl: the Markov chain saw|
Re^3: var comparisonby MidLifeXis (Monsignor)
|on Sep 06, 2012 at 19:19 UTC||Need Help??|
Clarity of intent.
Admittedly, in this case, it is not a very complex regexp, so it probably does not make much of a difference. If I am doing a full string comparison, I reach for eq. If I am matching a pattern, I reach for a regexp. It seems to me that any cue that you can give to the future-you reading your code is a good thing.
Update: As far as what to do once it gets a number of comparisons, refactor the comparisons out into a subroutine with a descriptive name and call it.
The following statement takes a bit to digest:( $var eq 'a' || $var eq 'b' || $var eq 'c' || $var eq 'd' )
where this replacement, at least to me, is much clearer:( isAnAllowedCharacter( $var ) )
This also allows you to change the definition of what a valid character (or whatever you are testing for) is without changing the code that is performing the test:
Update 2: Missed this one before:
This simplified example shows only two elements to compare but if there were more the expression could get quite long.
It seems to me that a regexp with many strings can be just as unreadable as a series of $var eq '...' comparisons. Whitespace (and /x on the regexp) can make a world of difference.