$c = "a_c_code";
$c =~ s/(?<![^_])(.)/ucfirst($1)/ge;
print $c;

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This ucfirsts any character that doesn't follow a non-_. (The double-negative condition is a more terse way of saying "follows a _ or at the beginning of a string": s/(?:\A|(?<=_))(.)/ucfirst($1)/ge.)

Why ucfirst instead of uc when only dealing with one character? Because there are ligature characters (the only latin1 instance being "\xdf") where the two produce different results.

In reply to Re: split and capitalize regex by ysth
in thread split and capitalize regex by arc_of_descent

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