第三篇

字符串过滤,只保留中文,字母和数字

function ClientScene:filter_spec_chars(s)

local ss = {}

for k = 1, #s do

local c = string.byte(s,k)

if not c then break end

if (c>=48 and c= 65 and c=97 and c

table.insert(ss, string.char(c))

elseif c>=228 and c

local c1 = string.byte(s,k+1)

local c2 = string.byte(s,k+2)

if c1 and c2 then

local a1,a2,a3,a4 = 128,191,128,191

if c == 228 then a1 = 184

elseif c == 233 then a2,a4 = 190,c1 ~= 190 and 191 or 165

end

if c1>=a1 and c1=a3 and c2

k = k + 2

table.insert(ss, string.char(c,c1,c2))

end

end

end

end

return table.concat(ss)

end