Forum: Ruby Subtracting strings

Is there a method for deleting a string identified in a variable from
another string, e.g.

<rubycode>
myunwantedword = "Hello"
myphrase = "Hello world"
output = myphrase.suchamethod(myunwantedword)
</rubycode>

output is now " world"

Regards

_John Sampson_

a = "hello world"
b = "hello "
a.sub!(b, "")

Is what I usually end up using. Hopefully I get corrected with a cleaner
way.

Hello,

yes, there is (two, actually). They are called String#gsub and
String#gsub!, respectively.

Regards

On 20/12/2012 18:22, Calvin Bornhofen wrote:
> Hello,
>
> yes, there is (two, actually). They are called String#gsub and
> String#gsub!, respectively.
>
> Regards
>
>
>
Many thanks - I did not know one could have a variable as an argument
for sub or sub!

Regards

_John S_

John Sampson wrote in post #1089759:
> On 20/12/2012 18:22, Calvin Bornhofen wrote:
>> Hello,
>>
>> yes, there is (two, actually). They are called String#gsub and
>> String#gsub!, respectively.
>>
>> Regards
>>
>>
>>
> Many thanks - I did not know one could have a variable as an argument
>

Any place a literal, e.g. 10, 'hello', [1, 2, 3], can be used, a 
variable
containing one of those values can be used in its place.

Another way, if you only want to remove the first instance:

>> myunwantedword = "Hello"
=> "Hello"
>> myphrase = "Hello world"
=> "Hello world"
>> output = myphrase.dup
=> "Hello world"
>> output[myunwantedword] = ""
=> ""
>> output
=> " world"
>>

Or you can use slice! instead of []=

>> output.slice!(myunwantedword)
=> "Hello"
>> output
=> " world"