修改单个RegEx以匹配字符串中的中间项

Question

This RegEx : {=tokenstring[^{}]*(?:{[^{}]*}[^{}]*)*}/g matches this string properly:

{=tokenstring?param1=11&param2={token-identifier}&param3={token-child-identifier}&param4=20}

(That string is a token which is being used in my website. It's value changes dynamically based on the provided request data in the content pages.)

I would like to add one more condition to the RegEx. For example "param3", to find if it exists or not in the string.

I know this new RegEx: /param3=([^&])/ will get the word "param3" from the string but how to fit that new RegEx into the original RegEx?

Answer 1

A tentative experiment with an online debugger. Before:

{=tokenstring[^{}]*(?:{[^{}]*}[^{}]*)*}

Debuggex Demo "before"

After:

{=tokenstring[^{}]*(?:{[^{}]*}[^{}]*)*param3=(?:{[^{}]*}[^{}]*)*}

Debuggex Demo "after"