Emoji value range

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The Unicode standard’s Unicode® Technical Report #51 includes a list of emoji (emoji-data.txt):

...
21A9 ;  text ;  L1 ;    none ;  j   # V1.1 (↩) LEFTWARDS ARROW WITH HOOK
21AA ;  text ;  L1 ;    none ;  j   # V1.1 (↪) RIGHTWARDS ARROW WITH HOOK
231A ;  emoji ; L1 ;    none ;  j   # V1.1 (⌚) WATCH
231B ;  emoji ; L1 ;    none ;  j   # V1.1 (⌛) HOURGLASS
...

I believe you would want to remove each character listed in this document which had a Default_Emoji_Style of emoji.

There is no way, other than reference to a definition list like this, to identify the emoji characters in Unicode. As the reference to the FAQ says, they are spread throughout different blocks.

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