[Vince]

PHP код:

static const cChars[] = {'.', '|', '{', '}'}; // note: single quotes
new bool:invalid = false;
for(new i, j = strlen(input); i < j && !invalid; i++)
{
    for(new c; c < sizeof(cChars); c++)
    {
        if(input[i] == cChars[c])
        {
            invalid = true;
            break;
        }
    }
}
if(invalid)
{
    // found invalid characters in input
}
else
{
    // no invalid chars
} 


You should probably use this as a function if you intend to use it in different places.