What to use for searching var for char

[blackcell]

I am wanting to search a variable that will contain a single character for a possibility of 10 characters. I am betting the best way would be to use an array for the possibilities but I don't know what to use and how to implement it. Would it be something similar to preg in php?

[cas]

I'm not entirely sure what you mean. You have a single character and want to see if it is one of 10 possible characters? This would work:

if(strchr("0123456789", your_char) != NULL) { /* it is 0 or 1 or .. 9 */ }

If you are, by chance, checking whether it is one of the digits from '0' to '9', you can use isdigit():

if(isdigit( (unsigned char)your_char )) { /* is a digit */ }

strchr() is prototyped in string.h, isdigit() in ctype.h. Unfortunately that cast to unsigned char is probably necessary, so it's not as clean as you might hope.