Retrieve regex location inside OpenResty Lua?

Question

How should I get the part that's matched by a regex location in OpenResty / Nginx Lua module?

For example, I want to use $1 in Lua in the following case:

location ~ ^/example/([0-9]+)/ {
  content_by_lua_block {
    -- What to use for \1 ?
    ngx.say("Code: " .. (ngx.var.1 + 1))
  }
}

The expected behavior would be getting Code: 1235 when visiting /example/1234/.

Dmitry Meyer · Accepted Answer · 2020-11-13 11:45:33Z

3

Replace ngx.var.1 with ngx.var[1]

From Lua reference manual:

The syntax var.Name is just syntactic sugar for var["Name"]

However, it only works with string keys.

From OpenResty manual:

Nginx regex group capturing variables $1, $2, $3, and etc, can be read by this interface as well, by writing ngx.var[1], ngx.var[2], ngx.var[3], and etc.

edited Nov 13, 2020 at 11:45

answered Nov 13, 2020 at 11:39

Dmitry Meyer

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