11. It is an old way to display an alphanumeric character . 12. The following list is largely limited to non-alphanumeric characters . 13. Classes and IDs are case-sensitive, start with letters, and can include alphanumeric characters and underscores. 14. Each " deck " of cards could contain up to 5.5 MB of alphanumeric characters . 15. USSD messages are up to 182 alphanumeric characters long. 16. Does Cluebot pick up instantly on every accidental mistyping of non-alphanumeric characters as potential vandalism? 17. Traditionally, filenames allowed only alphanumeric characters , but as time progressed, the number of characters allowed increased. 18. The BBAN must be of a fixed length for the country and comprise case-insensitive alphanumeric characters . 19. Normally searches ignore non-alphanumeric characters , but regular expressions ( regex ) accept all characters, plus metacharacters. 20. Some sites also block non-ASCII or non-alphanumeric characters .
