Replacing based on regular ecpressions

Ruby
1

Hi,

I’m writing a ruby script that does a batch search-and-replace command.

In each line of the file that is opened, I would like to delete part
of the entire part matched by a regrex. For example,

line.gsub(/(Tennis/Soccer/.+?).+?){
puts $& # entire match
puts $1 # the first match

}

I can successfuly identify the parts I need in the regres, now I want
to only keep the first match. Something like “$&” - “$1”.

I tried different methods such as String#delete, but they didn’t work
for me.

-T

2

On 17.03.2008 13:45, T K wrote:

I’m writing a ruby script that does a batch search-and-replace command.

In each line of the file that is opened, I would like to delete part
of the entire part matched by a regrex. For example,

line.gsub(/(Tennis/Soccer/.+?).+?){

That’s not a valid regular expression as far as I can see. So the whole
piece of code is not valid Ruby code.

puts $& # entire match
puts $1 # the first match

puts is not going to work for replacements.

}

I can successfuly identify the parts I need in the regres, now I want
to only keep the first match. Something like “$&” - “$1”.

Err, what? Can you please be a bit more specific? What is it that you
want to match and what is your expected output?

Did you maybe mean

line.gsub! %r{Tennis/Soccer/(.+?)}, ‘\1’

Note though that .+? will match a single character most of the time if
you do not place another expression with a more specific pattern
afterwards.

I tried different methods such as String#delete, but they didn’t work for me.

String#gsub and #gsub! are fine. You just need to use them properly.

Kind regards

robert