Lua url pattern matching

Question

I have below URIs:

/v1/resource1
/v1/resource1/{uuid}
/v1/resource1/{uuid}/resource2

I tried using /v1/resource1 and /v1/resource/+ as couple of patterns but the second pattern matches both 2nd and 3rd URIs

I want to have 3 separate patterns matching the above URIs separately. I am using string.match function for pattern matching.

Can someone help me with the Lua patterns?

Thanks

I tried using /v1/resource1 and /v1/resource/+ as couple of patterns but the second pattern matches both 2nd and 3rd URIs — Hrishikesh P Nerurkar
– Hrishikesh P Nerurkar, Commented Oct 24, 2018 at 18:22
Please share the code to repro the issue. Try the solution here - ideone.com/7sTHGs — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Oct 24, 2018 at 18:47
@WiktorStribiżew, the solution worked correctly. Thanks a lot for the help — Hrishikesh P Nerurkar
– Hrishikesh P Nerurkar, Commented Oct 24, 2018 at 19:09

Wiktor Stribiżew · Accepted Answer · 2018-10-24 19:10:59Z

1

You may use

string.match("/v1/resource1", "^/v1/resource%d*$")
string.match("/v1/resource1/{uuid}", "^/v1/resource1/[^/]*$")
string.match("/v1/resource1/{uuid}/resource2", "^/v1/resource1/[^/]*/[^/]*$")

See the online Lua demo

Last pattern details

^ - start of string
/v1/resource1/ - a literal string
[^/]* - 0 or more chars other than /
/ - a / char
[^/]* - 0 or more chars other than /
$ - end of string.

answered Oct 24, 2018 at 19:10

Wiktor Stribiżew

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Comments

user5992808 · Accepted Answer · 2018-10-25 07:44:32Z

But I think, it would be better, to have an universal pattern that works for all strings, that have the same structure. So you should avoid literal strings inside pattern (except, you are looking for exactly this).

list_url = {'/v1/resource1','/v1/resource1/{uuid}','/v1/resource1/{uuid}/resource2'}

patt1 = '^/[^/]+/[^/]+'
patt2 = patt1..'/%{[^}]+}'
patt3 = patt2..'/[^/]+'

for _, url in pairs(list_url) do
    print(url)
    print('\t', url:match(patt1..'$'))
    print('\t', url:match(patt2..'$'))
    print('\t', url:match(patt3..'$'))
end

output:

/v1/resource1
    /v1/resource1
    nil
    nil
/v1/resource1/{uuid}
    nil
    /v1/resource1/{uuid}
    nil
/v1/resource1/{uuid}/resource2
    nil
    nil
    /v1/resource1/{uuid}/resource2

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