Hi,
i would like to add to this.
In JavaScript replace function is basically used to replace some string in an another string. In replace function you can see that we are passing the regular expression to replace, but if the data is dynamic and i want to replace it in runtime .The over all concept is that in replace function of JavaScript we can not pass a variable to replace, we have to pass a regular expression - if we want to use a variable to replace we have to convert it to regularexpression.

thanks
Eliza