Kotlin Android allow only emojis and letters in a text

user_7679711 0
Viewed 308

I've been trying to find a good way to be able to keep only emojis and letters in a given text, but every article I found, I didn't have success with . I've tried to use regex, but seems that I can not make it work. I've tried to use emoji4j but it seems that this library is working with emojis in this form ":)", which don't help me, because my emojis are groups of unicode characters.

The result I want is the following : 

"This is. a text ‍‍‍,,1234" => "This is a text ‍‍‍"
"‍‍‍" => "‍‍‍"
"‍‍‍123abc‍‍‍" => "‍‍‍abc‍‍‍"

Here's the emoji regex : ?:[\u2700-\u27bf]|(?:[\ud83c\udde6-\ud83c\uddff]){2}|[\ud800\udc00-\uDBFF\uDFFF]|[\u2600-\u26FF])[\ufe0e\ufe0f]?(?:[\u0300-\u036f\ufe20-\ufe23\u20d0-\u20f0]|[\ud83c\udffb-\ud83c\udfff])?(?:\u200d(?:[^\ud800-\udfff]|(?:[\ud83c\udde6-\ud83c\uddff]){2}|[\ud800\udc00-\uDBFF\uDFFF]|[\u2600-\u26FF])[\ufe0e\ufe0f]?(?:[\u0300-\u036f\ufe20-\ufe23\u20d0-\u20f0]|[\ud83c\udffb-\ud83c\udfff])?)*|[\u0023-\u0039]\ufe0f?\u20e3|\u3299|\u3297|\u303d|\u3030|\u24c2|[\ud83c\udd70-\ud83c\udd71]|[\ud83c\udd7e-\ud83c\udd7f]|\ud83c\udd8e|[\ud83c\udd91-\ud83c\udd9a]|[\ud83c\udde6-\ud83c\uddff]|[\ud83c\ude01-\ud83c\ude02]|\ud83c\ude1a|\ud83c\ude2f|[\ud83c\ude32-\ud83c\ude3a]|[\ud83c\ude50-\ud83c\ude51]|\u203c|\u2049|[\u25aa-\u25ab]|\u25b6|\u25c0|[\u25fb-\u25fe]|\u00a9|\u00ae|\u2122|\u2139|\ud83c\udc04|[\u2600-\u26FF]|\u2b05|\u2b06|\u2b07|\u2b1b|\u2b1c|\u2b50|\u2b55|\u231a|\u231b|\u2328|\u23cf|[\u23e9-\u23f3]|[\u23f8-\u23fa]|\ud83c\udccf|\u2934|\u2935|[\u2190-\u21ff] .

If I try something like :

val regex = "the_whole_regex_above | [^a-zA-Z]".toRegex() myText.replace(regex,""), it won't replace anything, basically every character will pass

Basically I want to achieve pretty much the same thing as in this question, but using Kotlin.

kotlin android regex
1 Answers

You want to remove all punctuation, symbols (other than those used to form emojis) and digits.

To do that, you may use

myText = myText.replace("""[\p{N}\p{P}\p{S}&&[^\p{So}]]+""".toRegex(), "")

See the online Kotlin demo.

Details

  • [ - start of a character class that matches:
    • \p{N} - any Unicode digit
    • \p{P} - any Unicode punctuation proper
    • \p{S} - any Unicode symbol
    • &&[^\p{So}] - BUT the Unicode symbols belonging to Symbol, other Unicode category that are mostly used to form emojis
  • ]+ - 1 or more occurrences.
user_38329700
Related