2010-08-23 12:26:48 +00:00
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< title > replace all except some part< / title >
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< a href = "/Scratch/fr/blog/2009-09-replace-all-except-some-part/" onclick = "setLanguage('fr')" > Version Française< / a >
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replace all except some part
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< p > My problem is simple:< / p >
< p > 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< / p >
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< pre class = "twilight" >
...
text
...
BEGIN not to filter
...
text
...
END not to filter
...
text
...
< / pre >
< / div >
< p > I searched a better way to do that, but the best I can do is using < code > split< / code > and < code > scan< / code > .< / p >
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< pre class = "twilight" >
< span class = "Keyword" > def< / span > < span class = "Entity" > allExceptCode< / span > (< span class = "Variable" > f< span class = "Variable" > ,< / span > content < / span > )
regexp< span class = "Keyword" > =< / span > < span class = "StringRegexp" > < span class = "StringRegexp" > /< / span > < / span > < span class = "StringRegexp" > < code< span class = "StringRegexp" > < span class = "StringRegexp" > [< / span > ^> < span class = "StringRegexp" > ]< / span > < / span > *> .*?< < span class = "StringRegexpSpecial" > \/< / span > code> < / span > < span class = "StringRegexp" > < span class = "StringRegexp" > /m< / span > < / span >
tmp< span class = "Keyword" > =< / span > < span class = "String" > < span class = "String" > " < / span > < span class = "String" > " < / span > < / span >
mem< span class = "Keyword" > =< / span > []
content.< span class = "Entity" > scan< / span > (regexp).< span class = "Entity" > each< / span > < span class = "Keyword" > do < / span > |< span class = "Variable" > c< / span > |
mem < span class = "Keyword" > < < =< / span > c
< span class = "Keyword" > end< / span >
i< span class = "Keyword" > =< / span > < span class = "Constant" > 0< / span >
content.< span class = "Entity" > split< / span > (regexp).< span class = "Entity" > each< / span > < span class = "Keyword" > do < / span > |< span class = "Variable" > x< / span > |
tmp < span class = "Keyword" > < < =< / span > < span class = "Entity" > send< / span > (f,x)
< span class = "Keyword" > if< / span > < span class = "Keyword" > not< / span > mem[i].< span class = "Entity" > nil?< / span >
tmp < span class = "Keyword" > < < =< / span > mem[i]
i< span class = "Keyword" > +=< / span > < span class = "Constant" > 1< / span >
< span class = "Keyword" > end< / span >
< span class = "Keyword" > end< / span >
tmp
< span class = "Keyword" > end< / span >
< / pre >
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< p > An usage is:< / p >
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< pre class = "twilight" >
< span class = "Keyword" > def< / span > < span class = "Entity" > filter< / span > (< span class = "Variable" > content< / span > )
content.< span class = "Entity" > gsub< / span > (< span class = "StringRegexp" > < span class = "StringRegexp" > /< / span > < / span > < span class = "StringRegexp" > e< / span > < span class = "StringRegexp" > < span class = "StringRegexp" > /< / span > < / span > ,< span class = "String" > < span class = "String" > '< / span > X< span class = "String" > '< / span > < / span > )
< span class = "Keyword" > end< / span >
...
< span class = "Entity" > allExceptCode< / span > (< span class = "Constant" > < span class = "Constant" > :< / span > filter< / span > , content)
...
< / pre >
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< p > A better syntax would be:< / p >
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< pre class = "twilight" >
< span class = "Comment" > < span class = "Comment" > #< / span > !!!!!!!!!! THIS SYNTAX DOES NOT WORK !!!!!!! #< / span >
< span class = "Keyword" > def< / span > < span class = "Entity" > allExceptCode< / span > (< span class = "Variable" > f< span class = "Variable" > ,< / span > content < / span > )
regexp< span class = "Keyword" > =< / span > < span class = "StringRegexp" > < span class = "StringRegexp" > /< / span > < / span > < span class = "StringRegexp" > < code< span class = "StringRegexp" > < span class = "StringRegexp" > [< / span > ^> < span class = "StringRegexp" > ]< / span > < / span > *> .*?< < span class = "StringRegexpSpecial" > \/< / span > code> < / span > < span class = "StringRegexp" > < span class = "StringRegexp" > /m< / span > < / span >
tmp< span class = "Keyword" > =< / span > < span class = "String" > < span class = "String" > " < / span > < span class = "String" > " < / span > < / span >
content.< span class = "Entity" > split< / span > (regexp).< span class = "Entity" > each< / span > < span class = "Keyword" > do < / span > |< span class = "Variable" > x< / span > |
separator< span class = "Keyword" > =< / span > < span class = "Variable" > < span class = "Variable" > $< / span > & < / span >
tmp < span class = "Keyword" > < < =< / span > < span class = "Entity" > send< / span > (f,x)
< span class = "Keyword" > if< / span > < span class = "Keyword" > not< / span > separator.< span class = "Entity" > nil?< / span >
tmp < span class = "Keyword" > < < =< / span > separator
< span class = "Keyword" > end< / span >
< span class = "Keyword" > end< / span >
tmp
< span class = "Keyword" > end< / span >
< / pre >
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< p > I would expect the split make a search on a regular expression and then give the matched expression into the < code > $& < / code > variable. But it is not the case.< / p >
< p > If someone know a nicer way to do that I will be happy to know how.< / p >
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2010-08-31 13:06:43 +00:00
Created: 09/22/2009
2010-09-02 08:51:36 +00:00
Last modified: 05/09/2010
2010-08-23 12:26:48 +00:00
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