javascript - Write a regexp parsing URL -

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i trying write regex following

if have url 

example.com?mask=33&filter=23423&mode=12

it match substring filter=23423

i need consider url can be

example.com?filter=23423

thanks in advance.

you may not consider [\?&] in regexp , put /filter=[0-9]*/ if sure there not params other_filter=987 in url. if may have such use substr on resulted regexp 

url.match(/[\?&]filter=[0-9]*/)[0].substr(1)

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