Regular expression to remove one parameter from query string

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If you want to do this in just one regular expression, you could do this: 

/&foo(=[^&]*)?|^foo(=[^&]*)?&?/

This is because you need to match either an ampersand before the foo=…, or one after, or neither, but not both.

To be honest, I think it’s better the way you did it: removing the trailing ampersand in a separate step.

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