使用PCRE Regex将JSON值与特殊字符匹配

Question

I am trying to match the value for field password with a PCRE Regex (for use with ModSecurity).

Example input string:

{"username":"someuser","password":"$VS*'egrE"^87Me?.?vIiJ`+"}"}}"}"}

Expected Match:

$VS*'egrE"^87Me?.?vIiJ`+"}"}}"}

My broken PCRE Regex (it matches two groups instead of just the part I want):

^\{(?:.*)"password":"(.*?)\"\}$

Debuggex Demo

Or am I totally wrong and it is matching correctly?

Answer 1

Where is the password supposed to end? Your example looks like a JSON object to me, but then you must ensure that no unescaped " are in there which is the case in your example.

Your regex is matching everything until the last "} which is what you expected it to match.

If you just want to match the value of the password property, you could simple use: ^.*"password":"([^"]*)".*$

But keep in mind that this only works if there are no " within your password!