in reply to Regex Substitution Evaluations

Evaling strings is fraught with numerous pitfalls, and I would avoid that approach. Most modifiers can also be expressed directly in the regular expression. E.g.: 
m/foo/i; # -> m/(?i)foo/;
m/bar/m; # -> m/(?m)bar/;
...

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See perldoc perlre for more details. So either add them yourself, or require that the caller do so.

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Re^2: Regex Substitution Evaluations
by mobiusinversion (Beadle) on Jul 05, 2008 at 20:34 UTC
    Please refer to my original post.

    As you can see, I would absolutely like to avoid using eval, and I have consulted perldoc's perlre perlop perlretut and perlreref entries several times.

    How might you suggest going about substitutions?
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      I think pc88mxer answered your question for the most part. 

      $my_name = replace("august ferdinand mobius","\b(\w)","\U$1","igs");
# Becomes something more like...
$my_name = replace("august ferdinand mobius", qr/(?igs)\b(\w)/, '\U$1'
+);

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      Update: You should consider that your solution will not work for a variety of names, like mccleod, vomdorp, decaro, etc. For proper names, a dictionary (with the right library under it, like proper names) is a better way to go, and there is no perfect solution since the same spellings are sometimes capitalized differently. :(

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[d/l]

        I gave a few examples, more-or-less off the top of my head, in an article I wrote a number of years ago, when I was talking about the inadvisability of assumptions when it came to names: 

        John deJongh
Jan M. van de Geijn
Kathleen O'Hara-Mears
Siu Tim Au Yeung
Nang-Soa-Anee Bongoj Niratpattanasai
Mjölby J. de Waærn

        Also, assuming things about the order of, say, Chinese or Indian names is likely to run into problems - even within a given city, in the latter case. 

        
-- 
Human history becomes more and more a race between education and catastrophe. -- HG Wells
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        The names problem is interesting, although I'm sort of kicking myself for giving it as an example. The motivation for this post was and is to develop a general substitution framework for parametrized regex creation...
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