Can't get number from string

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#1

I’m trying to get the number from a string, but it’s not working for some string

local ZoneNumber = tonumber(string.gsub(Player:GetAttribute("CurrentZone"), "%D", ""))
if not ZoneNumber then
		warn("Could not get zone number", Player:GetAttribute("CurrentZone"), "defaulting to Zone1")

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#2

Have you tried printing whatever the string is?

print(string.gsub(Player:GetAttribute("CurrentZone"), "%D", ""))
#3

By string.gsub you’re literally removing all the digits from the string. tonumber() would return nil because the string is either empty or it only has letters.

#4

That’s incorrect – by capitalizing %d (to %D) it captures every character that wasn’t a number.
@NinjoOnline have you tried using Player:GetAttribute("CurrentZone"):match("^Zone(%d+)")?

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#5

string.gsub() returns how many replacements it made as its second argument; additionally, tonumber() accepts a second argument specifying the base. As such, your code is attempting to convert to Base4 and is having problems.

This will fix the problem:

local ZoneNumber = tonumber(select(1,string.gsub(Player:GetAttribute("CurrentZone"), "%D", "")))

Alternatively, you could just capture the number with this:

local ZoneNumber = tonumber(string.match(Player:GetAttribute("CurrentZone"),"%d+"))
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#6

local number = string.gmatch(stringObject, "%d+")

To match the first occurence of an integer in a string.