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stringlualua-patterns

What is the right pattern to for numbers with negative symbol?

I have a string of numbers separated by spaces and I need to store them in a table but for some reason negative symbol is not getting recognize.

cord = "-53 2 -21"
map = {}
for num in cord:gmatch("%w+") do 
    table.insert(map, num) 
end
map[1], map[2], map[3] = tonumber(map[1]), tonumber(map[2]), tonumber(map[3])
print(map[1])
print(map[2])
print(map[3])

This is the output I'm getting:

53
2
21

I think the problem is with the pattern I'm using, what should I change?

Solution

  • The pattern "%w" is for alphanumeric characters, which doesn't include -, use this pattern instead:

    "%-?%w+"

    or better:

    "%-?%d+"

    since numbers are all you need.