C# - The unicode regular expression to remove emoticons also remove another chars

Asked Feb 03 '20 at 18:50

Active Feb 03 '20 at 19:00

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I'm using this statement to remove emoticons from a string:

text = Regex.Replace(text, @"[^\u1F600-\u1F64F]+", "");   //Emoticons

Based on the official Unicode page chart, https://www.unicode.org/charts/PDF/U1F600.pdf.

But this replace statement not only remove emoticons also removes another characters like "." or "-".

Why is that?

edited Feb 03 '20 at 18:52

GSerg

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asked Feb 03 '20 at 18:50

Uriel Falak

But mostly of the characters not being removed. Like "A" or "B" or "C" – Uriel Falak Feb 03 '20 at 18:55
The expression in brackets is parsed out as `\u1F60`, `0-\u1F64`, `F`. So it removes everything that is not `\u1F60`, not `F`, and not between character `0` and character `\u1F64`. – GSerg Feb 03 '20 at 18:56
Oh and how it needs to be to remove all between that ranges? – Uriel Falak Feb 03 '20 at 18:58
Use `@"(?:[\0-\uD7FF\uE000-\uFFFF]|[\uD800-\uD83C\uD83E-\uDBFF][\uDC00-\uDFFF]|\uD83D[\uDC00-\uDDFF\uDE50-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF])+"` – Wiktor Stribiżew Feb 03 '20 at 19:20
Yes, GSerg's link has that convered. Must treat all emoticons as two characters, first of which is the same for all. Must figure out these character pairs for all emoticons. – Dialecticus Feb 03 '20 at 19:20
@WiktorStribiżew that not working. it remove all characters – Uriel Falak Feb 03 '20 at 19:28
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Yeah, just what `[^\u1F600-\u1F64F]+` does. It removes all but those emojis. The reverse is `@"(?:\uD83D[\uDE00-\uDE4F])+"` – Wiktor Stribiżew Feb 03 '20 at 19:29
So, what do you need? – Wiktor Stribiżew Feb 03 '20 at 19:45
I need the regular expression that works in c# to remove all the emoticons – Uriel Falak Feb 03 '20 at 19:53
[Here you go](https://stackoverflow.com/a/48148218/3832970). – Wiktor Stribiżew Feb 03 '20 at 19:55
Then you should remove the cap character, `^`. When this baby is first character in brackets`[]` it means match everything EXCEPT the stuff that follows inside. – Dialecticus Feb 03 '20 at 19:58
@WiktorStribiżew it works! – Uriel Falak Feb 03 '20 at 20:06
@WiktorStribiżewof course that a more short regular expression will be much better, but this work – Uriel Falak Feb 03 '20 at 20:07

C# - The unicode regular expression to remove emoticons also remove another chars

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