Difficulties with Lua patterns

[JeViCo]

Hello everyone. I've recently tried to make roleplay nickname pattern  (example: Nicolas_Cage) but it doesn't work properly

addCommandHandler("checkName",function(pl)
	local name = getPlayerName(pl)
	if string.match(name,"(%u?)(%l+)%_(%u?)(%l+)") then
		outputChatBox("rp nickname")
	else
		outputChatBox("nonrp nickname")
	end
end)

I can use Nikolas_CAgE and it'll match

i used this and this wikis

What am i doing wrong?

Edited October 13, 2018 by JeViCo

[Gordon_G]

I've never understood lua's patterns too, gonna be helpful for me too

[Pirulax]

Here's your magic pattern.
 

"(%u%l+)_(%u%l+)$"

The '?' was the problem, since, as the manual describes, it'll make that :~(ex.: %u) optional, also I added a '$' too.

 

[JeViCo]

17 hours ago, Pirulax said:

"(%u%l+)_(%u%l+)$"

same result

[SaNoR]

"^%u(%l+)_%u(%l+)$"

 

[JeViCo]

21 hours ago, SaNoR said:

^%u(%l+)_%u(%l+)$

it works! Thank you. So how did you do that? ( ) means subpattern and ^ at the beginning and $ at the end of string mean - 'match whole string from the start till the end'

Am i right?

[SaNoR]

3 minutes ago, JeViCo said:

it works! Thank you. So how did you do that? ( ) means subpattern and ^ at the beginning and $ at the end of string mean - 'match whole string from the start till the end'

Am i right?

Yes

[JeViCo]

1 minute ago, SaNoR said:

Yes

Thank you so much. Now i understand patterns a little bit more 

[SaNoR]

You are welcome