Rob wrote:
> I have an array with the following elements:
> 
> array[0] = "car"
> array[1] = "bike"
> array[2] = "motorcicle"
> .......
> array[n] = .........
> 
> And I have a string with the following text.
> 
> "Today I went to school by car. I saw............ "
> 
> What I am trying to do is that everytime the program finds one of the words
> from the list in the text,
> it will place an astherisc * to replace that word.
> 
> But I cannot figure out how to do this because it is an array not a regular
> expression.

You can interpolate it into a regex, but I don't know how well that scales:

array = []
array[0] = "car"
array[1] = "bike"
array[2] = "motorcicle"

string = "Today I went to school by car. I saw............ "

p string.gsub(/#{array.join("|")}/o) {|s| "*" * s.size}