How to modify HTTP response body with Charles Proxy rewrite tool and regex?

Question

I'm trying to change HTTP response body with Charles Proxy using rewrite tool / regex? The response is a JSON.

So part of the returned response JSON body is:

"unavailablePosts": ["AA", "BB"],

and what I want is:

"unavailablePosts": "XXX",

I try to set up Charles' rewrite like this:

So the regex is like:

"unavailablePosts": \[(.*)\],

But ... (as I'm asking this question) it does not work, i.e. nothing is changed in response body.

What do you mean by "does not work"? (IMHO, SO should not let post questions with this phrase.) You should say what it does not *match* and what it should *match*. — Wiktor Stribiżew, Nov 04 '16 at 10:16
Perhaps, there are whitespaces in between, but only you can check that. Try `"unavailablePosts"\s*:\s*\[([\s\S]*?)\],` — Wiktor Stribiżew, Nov 04 '16 at 10:20
with your regex it does not even work in "regex sandbox" like https://regex101.com/ — Marian Paździoch, Nov 04 '16 at 10:26
Shall I post the solution? Does it work the way you expect on your end? — Wiktor Stribiżew, Nov 04 '16 at 14:02
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/127389/discussion-between-marian-pazdzioch-and-wiktor-stribizew). — Marian Paździoch, Nov 04 '16 at 15:09

score 8 · Accepted Answer · answered Nov 04 '16 at 14:36

I believe there are some linebreaks in between the values, and to match them you need to add \s* (zero or more whitespaces) around : and use [\s\S]*? (any 0+ chars but as few as possible as *? is a lazy quantifier) to match the substring between [ and ],:

 "unavailablePosts"\s*:\s*\[([\s\S]*?)\],

score 2 · Answer 2 · answered Nov 14 '18 at 08:51

2

I had similar issue. In this case Regex is ("unavailablePosts":)"[\s\S]*?" Value for replace is $1"anything"

answered Nov 14 '18 at 08:51

Andrii Koshman

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How to modify HTTP response body with Charles Proxy rewrite tool and regex?

2 Answers2