Special iPhone characters not allowed by regex

[Favo02]

Some characters are not allowed by the regex used for input validation, like ’•“”«» or emojis.

[Favo02]

Possible solutions:

• allow some hand-picked unicode characters, like all characters available on iPhone keyboard (€’•“”«»)
• limit the number of consecutive unicode combinators (how?)
• do not allow characters in range /[\xCC\xCD]/, which are typically zalgo text
• allow all unicode, but limit display with CSS overflow:hidden

Resources:

• how can Zalgo text be detected
• protect against diacritics
• regex against combination of characters
• CC and CD unicode ranges
• overflow hidden