Hi,
Yet another newbie question about regular expressions:
I'd like to find and replace bits of text as usual. However, rather than
replace all occurrences in one quick swoop using the s-operator and the
g-flag, the replacement is so complex that it cannot be expressed as a
straight substitution. So I would have to find a piece of text, process it
in a separate function, and replace the matched text with the newly computed
text. This goes on for n interesting matches in the input.
Can I do this kind of thing in a simple loop, processing all matches one by
one? My understanding is that pos and some special variables will tel me the
character index of the mach in a string. But if I then go and modify the
string using substr to do the substitution, wil it reset the search
position to the beginning when trying to match the next interesting bit? The
replacement text is by nature longer than the original so the input string
needs to grow on each substitution which might present a problem to the
matching operator. I took a look at perlop and some books I have on Perl but
didn't end up with a definitive answer of how I should solve this problem.
That was the problem abstractly put, here's the specific instance:
I'm writing a program to convert notes given in the music macro language to
their equivalent pitches that are applied using markup tags for speech
synthesizers. I can match a note easily, and have functions for computing
the pitch and the tag in question. As the note values don't depend on each
other in any way, I'd like to completely process one note at a time, doing
the replacement, and then continue matching the next note where it
previously left off. Naturally there are other tokens than just notes in the
input so I need to maintain the position of the note data in the input
string. If I modify a separate copy of the string, it will throw off the
pos() indeces because the substitutions will change the length of the copy.
Any help appreciated as usual.
PS: If the problem statement is still a bit fuzzy or incomplete, just ask
and I'll try to provide more info.
--
With kind regards Veli-Pekka Tätilä ([EMAIL PROTECTED])
Accessibility, game music, synthesizers and programming:
http://www.student.oulu.fi/~vtatila/
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