Should dot be escaped in declarativeNetRequest regexFilter?

[Vaibhav Nigam]

Hi,

Documentation for RuleCondition in declarativeNetRequest API says:

regexFilter can be used as "Regular expression to match against the network request url. This follows the RE2 syntax".

As per RE2 syntax, dot '.' is not a metacharacter and can match itself.

But in examples on Chrome docs page, dot has been escaped in regexFilter.

{
"id": 7,
"priority": 1,
"action": {
"type": "redirect",
"redirect": {
"regexSubstitution": "https://\\1.xyz.com/"
}
},
"condition": {
"regexFilter": "^https://www\\.(abc|def)\\.xyz\\.com/",
"resourceTypes": [
"main_frame"
]
}
},

Is there an exhaustive list of special characters to be escaped in regexFilter?

Thanks,

Vaibhav Nigam

[wOxxOm]

In regexFilter dots must be escaped and the RE2 documentation you've linked says as much i.e. dot matches "any character".

In regexSubstitution dot is a plain character so it must not be escaped.

[Vaibhav Nigam]

Thanks @wOxxOm. That makes it clear.