Lua Script match multiple word

Question

My first time, I try Lua script, I want to match on string (user-Agent), multiple substring to exclude them when it is match.

pattern string is User-Agent pattern, and the multiple string are google, safari and edge

 local m, err = ngx.re.match(ngx.req.get_headers()['User-Agent'], "(*google*|*safari*|*edge*)", "io")
    if not m
    then
      ..
    end

The problem User-Agent contain google, safari, edge string is still present on my request.

For instance User-Agent :

Mozilla/5.0 (**google**; CPU iPhone OS 14_4 like Mac OS X) 
Mozilla/5.0 (**safari**; CPU iPhone OS 15_1 like Mac OS X) 
Timescode_RESTClient **edge** alpha

I want to exclude them.

This looks like your using a `regex` library in lua not a `lua-pattern`, is that correct? — Nifim, Jan 07 '22 at 16:55
What do you mean by "edge string is still present on my request"? You aren't doing anything with your request, and your regex looks invalid (ngx.re uses PCRE expressions) - I'm guessing that `err` contains an error message — piotrp, Jan 13 '22 at 11:03
I mean , the requests with User-Agent still match on regex, and I cannot exclude them, so my regex is not correct — ezceeaaaa, Jan 13 '22 at 13:45

score 0 · Answer 1 · answered Jan 19 '22 at 10:29

0

ngx.re.match uses PCRE regular expressions where * means roughly "zero or more repetitions of whatever is before it", so you must escape it: (\*google\*|\*safari\*|\*edge\*)

answered Jan 19 '22 at 10:29

piotrp

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Lua Script match multiple word

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