Can it detect a string is all emoji or not?

[mana-ai]

Hi Sir, thanks for this useful repo.

I wanna detect a string is all emoji or not, take an example:

😄😄 -> yes
😄 ff -> not

So how to achieve that using this repo? thanks in advance!

[petehouston]

You can use parse.unemojify() which is to convert the emoji string info text format, then verify the text.

parser.unemojify('I ❤️ ☕'); // returns: 'I :heart: :coffee:'

Now, if all words are emojis then each should start with a : and end with a :; otherwise, it is not an emoji.

[mana-ai]

@petehouston What about text in the middle?

such as 😄😄hahah😄

[mana-ai]

@petehouston Wanna it contains continuesly pure emoji then mark it as true, otherwise treat as normal.

[dm8tr]

You can use parse.unemojify() which is to convert the emoji string info text format, then verify the text.

parser.unemojify('I ❤️ ☕'); // returns: 'I :heart: :coffee:'

Now, if all words are emojis then each should start with a : and end with a :; otherwise, it is not an emoji.

Maybe there is a better way to do this but following @petehouston comment I did something like this

import 'package:flutter_emoji/flutter_emoji.dart';

/*code*/

bool isAllEmoji(String text) {
  for (String s in EmojiParser().unemojify(text).split(" ")) if (!s.startsWith(":") || !s.endsWith(":")) return false;
  return true;
}

[mitinKevadiya]

You can use parse.unemojify() which is to convert the emoji string info text format, then verify the text.

parser.unemojify('I ❤️ ☕'); // returns: 'I :heart: :coffee:'

Now, if all words are emojis then each should start with a : and end with a :; otherwise, it is not an emoji.

Maybe there is a better way to do this but following @petehouston comment I did something like this

import 'package:flutter_emoji/flutter_emoji.dart';

/*code*/

bool isAllEmoji(String text) {
  for (String s in EmojiParser().unemojify(text).split(" ")) if (!s.startsWith(":") || !s.endsWith(":")) return false;
  return true;
}

I think we have check one more condition for this

import 'package:flutter_emoji/flutter_emoji.dart';

/*code*/

bool isAllEmoji(String text) {
    for (String s in EmojiParser().unemojify(text).split(" ")) {
      if (!s.startsWith(":") || !s.endsWith(":")) return false;
    }
    List<String> parseEmoji = EmojiParser().parseEmojis(text);
    if(parseEmoji.isNotEmpty) {
      String text1 = text;
      for(String s in parseEmoji) {
        text1 = text1.replaceAll(s, "");
      }
      if(text1.isNotEmpty) {
        return false;
      }
    }
    return true;
  }

[salaryazdjerdi]

This is the correct solution.

  bool hasOnlyEmojis(String input) {
    // find all emojis
    final emojis = EmojiParser().parseEmojis(input);

    // return if none found
    if (emojis.isEmpty) return false;

    // remove all emojis from the input
    for (final emoji in emojis) {
      input = input.replaceAll(emoji, "");
    }

    // remove all whitespace (optional)
    input = input.replaceAll(" ", "");

    // return true if nothing else left
    return input.isEmpty;
  }

[migalv]

All of this works, unless you use the emojis that have color 👍🏻

UPDATE

This works:

final emojisRegExp =
    RegExp(r"(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])");

bool isOnlyEmojis(String text) {
    // find all emojis
    final emojis = emojisRegExp.allMatches(text);

    // return if none found
    if (emojis.isEmpty) return false;

    // remove all emojis from the this
    for (final emoji in emojis) {
      text = text.replaceAll(emoji.input.substring(emoji.start, emoji.end), "");
    }

    // remove all whitespace (optional)
    text = text.replaceAll(" ", "");

    // return true if nothing else left
    return text.isEmpty;
  }

  /// True if the string is only emojis and the number of emojis is less than [maxEmojis]
  bool isLessEmojisThan(String text, int maxEmojis) {
    final allEmojis = emojisRegExp.allMatches(text);
    final numEmojis = allEmojis.length;

    if (numEmojis < maxEmojis && isOnlyEmojis(text)) {
      return true;
    }

    return false;
  }

[yalda-student]

All of this works, unless you use the emojis that have color 👍🏻

UPDATE

This works:

final emojisRegExp =
    RegExp(r"(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])");

bool isOnlyEmojis(String text) {
    // find all emojis
    final emojis = emojisRegExp.allMatches(text);

    // return if none found
    if (emojis.isEmpty) return false;

    // remove all emojis from the this
    for (final emoji in emojis) {
      text = text.replaceAll(emoji.input.substring(emoji.start, emoji.end), "");
    }

    // remove all whitespace (optional)
    text = text.replaceAll(" ", "");

    // return true if nothing else left
    return text.isEmpty;
  }

  /// True if the string is only emojis and the number of emojis is less than [maxEmojis]
  bool isLessEmojisThan(String text, int maxEmojis) {
    final allEmojis = emojisRegExp.allMatches(text);
    final numEmojis = allEmojis.length;

    if (numEmojis < maxEmojis && isOnlyEmojis(text)) {
      return true;
    }

    return false;
  }

your code helps me. TNX

[shivanshukumar]

All of this works, unless you use the emojis that have color 👍🏻

UPDATE

This works:

final emojisRegExp =
    RegExp(r"(\u00a9|\u00ae|[\u2000-\u3300]|\ud83c[\ud000-\udfff]|\ud83d[\ud000-\udfff]|\ud83e[\ud000-\udfff])");

bool isOnlyEmojis(String text) {
    // find all emojis
    final emojis = emojisRegExp.allMatches(text);

    // return if none found
    if (emojis.isEmpty) return false;

    // remove all emojis from the this
    for (final emoji in emojis) {
      text = text.replaceAll(emoji.input.substring(emoji.start, emoji.end), "");
    }

    // remove all whitespace (optional)
    text = text.replaceAll(" ", "");

    // return true if nothing else left
    return text.isEmpty;
  }

  /// True if the string is only emojis and the number of emojis is less than [maxEmojis]
  bool isLessEmojisThan(String text, int maxEmojis) {
    final allEmojis = emojisRegExp.allMatches(text);
    final numEmojis = allEmojis.length;

    if (numEmojis < maxEmojis && isOnlyEmojis(text)) {
      return true;
    }

    return false;
  }

still does not work for many emojis with skin tone set or for all emojis. Need a way to expand the list of emojis to match and support skin tone match.