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What I want to do is str.replace(pattern, callback),
not simply str.replace(pattern, replace_pattern),
is it possible to do it in javascript?
Why, yes, you can do exactly that:
str.replace(pattern, function () { ... }).Here’s some documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#specifying_a_function_as_the_replacement