Edit macro variables values extracted from web page in successive POST request using function "replace(<what>,<to_what>)"

Edit macro variables values extracted from web page in successive POST request using function "replace(<what>,<to_what>)"
It can be realized like already existing urlencode/urldecode ({{macro}.urlencode()}) :{{macro}.replace(<what_sub_str>,<to_what_sub_str>)}

Example:
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POST request #1 returned the following text (JSON):
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{"var":"someurlpart\/someurlpart\/someurlpart\/someurlpart\/"}

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We define macro variable

{SOMEVAR} and extract using regexp the follwing value: "someurlpart\/someurlpart\/someurlpart\/someurlpart\/" (without quotes).
In second web step we need to use value of {SOMEVAR}

as "someurlpart/someurlpart/someurlpart/someurlpart/". Now it can't be archived, but with implementation of "replace(<>,<>)" function it could be easily done by {{SOMEVAR}.replace("
","")}
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