My experience is that many companies implement such input checking incorrectly. For example, many sites will complain if I enter my card number 4567 8910 1112 1314, even though that is the correct format as on the card, and it would be very easy to remove the spaces. No, they insist on 4567891011121314. I had difficulties with a parcel last year because I mistakenly entered the recipient's phone number wrongly, with ten keystrokes. It would have been very easy to show an error message saying the phone number should have eleven digits.
Babu Muthukrishnan wrote:. . . How various companies implementing solution to problem[?] . . .
A long time ago I was at a well‑known University in LA and the email system had such censorship. I had something to drink and then thought I would wash it down with some beer. And the system changed that to, “waXX XX down…”
Babu Muthukrishnan wrote:. . . the program will replace the bad word with asterisks . . .