From: Kent Dahl <kentda@...>
Date: 2001-11-26T21:25:50+09:00
Subject: [ruby-talk:26501] Re: String editing question

HarryO wrote:
> That was the sort of thing I was getting at if I approached it from
> the point of view of the UNacceptable tags.

Oh, I read that as "ignore" UNacceptable tags.

> If there are many tags in the string, I'd have to do the regexp matching
> multiple times.  How do I avoid it simply matching the same tags over
> and over again (in the case where the regexp matches an acceptable
> tag, rather than an unacceptable one)?

String.gsub should do the trick. 
I was thinking something (naive) such as this:
	str = "<br> <p> <hr> <p align='center'>"
	str.gsub( /<[^>]*>/ ){ |i| puts i; "-"+i.to_s+"-" }

Output:
	"-<br>- -<p>- -<hr>- -<p align='center'>-"

In the block, i is the match, and whatever value you return from the
block, is substituted for the matched regexp. 

Really naive:
	legal = ["<br>","<hr>","<p>"]
	str.gsub(/<[^>]*>/){ |i|
		s = i.to_s; 
		if legal.index(s) then 
			s 
		else
			s.gsub("<","&lt;").gsub(">","&gt;") 
		end 
	}

Output:
	"<br> <p> <hr> &lt;p align='center'&gt;"

HTH

-- 
<[ Kent Dahl ]>================<[ http://www.stud.ntnu.no/~kentda/ ]>
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