Rails - Sep 2012 - How to escape a forward slash with gsub, also does interpolation work with gsub?

I am trying this:

I want to replace all the text in between java comments:

/* start */
replace this text here
/* end */


I''m trying:

text.gsub(//* start */(.*)/* end *//im, replace_with)

But i''m getting errors relating to expecting keyword_end.

How should I be escaping /* and */   ?

Also, does string interpolation work in gsub regex?  Say I had variables
like:

start_tag = "/* start */"
end_tag = "/* end */"

I want to do:

text.gsub("#{start_tag}(.*)#{end_tag}", replace_with)

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You have to escape the slashes and asterisk in the regex, as they are 
regular expression characters. http://rubular.com is a great place to learn 
and play around with regular expressions.

    text.gsub(/\/\* start \*\/(.*)\/\* end \*\//im, replace_with)

Yes, interpolation works in regular expressions:

    text.gsub(/#{start_tag}(.*)#{end_tag}/, replace_with)


On Sunday, September 30, 2012 4:17:03 PM UTC-7, Gitted
wrote:
>
> I am trying this:
>
> I want to replace all the text in between java comments:
>
> /* start */
> replace this text here
> /* end */
>
>
> I''m trying:
>
> text.gsub(//* start */(.*)/* end *//im, replace_with)
>
> But i''m getting errors relating to expecting keyword_end.
>
> How should I be escaping /* and */   ?
>
> Also, does string interpolation work in gsub regex?  Say I had variables 
> like:
>
> start_tag = "/* start */"
> end_tag = "/* end */"
>
> I want to do:
>
> text.gsub("#{start_tag}(.*)#{end_tag}", replace_with)
>
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thanks!

BTW, is it possible that during the replace, it leaves the start/end tag?
Currently it is replacing it also, I want the comments to be there after
the replacement.


On Sun, Sep 30, 2012 at 7:49 PM, bricker
<bricker88-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> You have to escape the slashes and asterisk in the regex, as they are
> regular expression characters. http://rubular.com is a great place to
> learn and play around with regular expressions.
>
>     text.gsub(/\/\* start \*\/(.*)\/\* end \*\//im, replace_with)
>
> Yes, interpolation works in regular expressions:
>
>     text.gsub(/#{start_tag}(.*)#{**end_tag}/, replace_with)
>
>
> On Sunday, September 30, 2012 4:17:03 PM UTC-7, Gitted wrote:
>>
>> I am trying this:
>>
>> I want to replace all the text in between java comments:
>>
>> /* start */
>> replace this text here
>> /* end */
>>
>>
>> I''m trying:
>>
>> text.gsub(//* start */(.*)/* end *//im, replace_with)
>>
>> But i''m getting errors relating to expecting keyword_end.
>>
>> How should I be escaping /* and */   ?
>>
>> Also, does string interpolation work in gsub regex?  Say I had
variables
>> like:
>>
>> start_tag = "/* start */"
>> end_tag = "/* end */"
>>
>> I want to do:
>>
>> text.gsub("#{start_tag}(.*)#{**end_tag}", replace_with)
>>
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>
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>
>
>
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Quoting S Ahmed
<sahmed1020-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> I am trying this:
> 
> I want to replace all the text in between java comments:
> 
> /* start */
> replace this text here
> /* end */
> 
> 
> I''m trying:
> 
> text.gsub(//* start */(.*)/* end *//im, replace_with)
> 
> But i''m getting errors relating to expecting keyword_end.
> 
> How should I be escaping /* and */   ?
Yes,
text.gsub(/\/\* start \*\/(.*)\/\* end \*\//im, replace_with)

Slightly simpler
text.gsub(%r{/\* start \*/(.*)/\* end \*/}im, replace_with)
> 
> Also, does string interpolation work in gsub regex?  Say I had variables
> like:
> 
> start_tag = "/* start */"
> end_tag = "/* end */"
> 
> I want to do:
> 
> text.gsub("#{start_tag}(.*)#{end_tag}", replace_with)
> 
gsub takes regex, not strings

text.gsub(/#{start_tag}(.*)#{end_tag}/, replace_with)

Special characters do need to be escaped in start_tag and end_tag, but in this
case only the asterisks, not the slashes.

HTH,
  Jeffrey

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