# replace all except some part

My problem is simple:

I want to filter a text except some part of it. I can match easily the part I don’t want to be filtered. For example

...
text
...
BEGIN not to filter
...
text
...
END not to filter
...
text
...

I searched a better way to do that, but the best I can do is using split and scan.

def allExceptCode( f, content )
# Beware the behaviour will change if you add
# parenthesis (groups) to the regexp!
regexp=/<code[^>]*>.*?<\/code>|<pre[^>]*>.*?<\/pre>/m
tmp=""
mem=[]
content.scan(regexp).each do |c|
mem <<= c
end
i=0
content.split(regexp).each do |x|
tmp <<= send(f,x)
if not mem[i].nil?
tmp <<= mem[i]
i+=1
end
end
tmp
end

An usage is:

def filter(content)
content.gsub(/e/,'X')
end
...
allExceptCode(:filter, content)
...

A better syntax would be:

# !!!!!!!!!! THIS SYNTAX DOES NOT WORK !!!!!!! #
def allExceptCode( f, content )
regexp=/<code[^>]*>.*?<\/code>/m
tmp=""
content.split(regexp).each do |x|
separator=$& tmp <<= send(f,x) if not separator.nil? tmp <<= separator end end tmp end I would expect the split make a search on a regular expression and then give the matched expression into the$& variable. But it is not the case.

If someone know a nicer way to do that I will be happy to know how.

## Comments

comments powered by Disqus
Published on 2009-09-22
Done with Vim & nanoc Hakyll