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function string:lstrip()
return self:gsub("^%s+", "")
end
function string:rstrip()
if self == nil then
return nil
end
local s = self:gsub("%s+$", "")
return s
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<
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function string:lstrip()
return self:gsub("^%s+", "")
end
function string:rstrip()
return self:gsub("%s+$", "")
end
function string:strip()
return self:lstrip():rstrip()
end
function string:startswith(text)
local size = text:len()
if self:sub(1, size) == text then
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