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Re: Quick question about pattern matching uppercase letters

by mce (Curate)
on Apr 27, 2004 at 14:47 UTC ( #348520=note: print w/ replies, xml ) Need Help??


in reply to Quick question about pattern matching uppercase letters

Hi,

Some context code would be nice.

Anyway, this should do the trick

perl -p -e "s|\b([A-Z]+)\b|<i>\1</i>|g;" yourfile

---------------------------
Dr. Mark Ceulemans
Senior Consultant
BMC, Belgium


Comment on Re: Quick question about pattern matching uppercase letters
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Re: Re: Quick question about pattern matching uppercase letters
by dragonchild (Archbishop) on Apr 27, 2004 at 14:52 UTC
    Better is s|\b([A-Z]+)\b|<i>$1</i>|gm;. Don't use backreferences if you don't have to. They're difficult to debug when they have an error. Plus, you'll need the /m modifier to match across multiple lines.

    Update: As pointed out to me, /m isn't needed here. This is a case of learning a rule early and never learning the reasons behind the rule. (/m is for "multiple lines")

    ------
    We are the carpenters and bricklayers of the Information Age.

    Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose

      //m changes the meaning of ^ and $ and there aren't any of those there, so it isn't needed. //m doesn't do anything else. And using \1 on the right side of a subst isn't actually a backreference and doesn't make anything harder to debug, it's just deprecated syntax.

      The use of \1 is a sign that the poster forgot to enable warnings, though.

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