Question: Is it allowed to pass data of the same stream after (un)successful matching?

[socketpair]

Also, for example, for regex _qwe_qwe_ and string _qwe_qwe_qwe_qwe_, how many matches I should see ?

[agentzh]

@socketpair You have total control over what to do next (after finding a match).

[socketpair]

Still not understand what will (should) happen ?

[agentzh]

@socketpair You decide what to do next. You have the complete control. You can check out the ngx_replace_filter module for various different options.

[agentzh]

Consider it resolved.