CODEWITHSUNDEEP
regexstringdartunicodehashtag
not working
not working

Reputation: 667

Regexp dart for arabic characters in dart

How are you?

I am a beginner in dart and flutter and I am also a new programmer and It's the first time I ask a question on StackOverflow.

I am training now on regular expressions and I am trying to create a one to match all characters with hashtag sign like:

anyway, everything is going okay but actually, when I try to replace the string which is in English with Arabic I get stuck.

void main() {
  String text = "#اسمي_هنا";
  RegExp exp = new RegExp(r"\B#\w\w+" , unicode: true , multiLine: true);
  exp.allMatches(text).forEach((match) {
    print(match.group(0));

    if (match.group(0) == null) {
      print(null);
    }
  });

}

it doesn't even prints null.

Upvotes: 3

Views: 4762

Answers (3)

Mahmoud Sabri
Mahmoud Sabri

Reputation: 795

TextField
(
        inputFormatters: 
        [ WhitelistingTextInputFormatter(RegExp("[a-z\u0621-\u064a-\ ]",unicode: true)), ],
)

Upvotes: 4

npinti
npinti

Reputation: 52185

The \w character is shorthand for [A-Za-z0-9_]. In your case, you are using an Arabic Alphabet, so the expression will not match, since A-Z belongs to a Latin Alphabet.

One way to go around it is to use \p{L}, this will basically match any letter, regardless of language. For more information on the topic, you can looking into regular expressions with an interest in unicode matches.

EDIT: As per your comment, the issue with this section of the expression: #\p{L}+[_]+\p{L}+, the engine is expecting a hash, letters (one or more), followed by an underscore (one or more) followed by letters (one or more).

In your other example, wherein we can have the following form of string: #foo and #foo_bar, we need to ammend the expression such that the _bar section is optional. To do this, we alter the expression as follows: #\p{L}+([_]+\p{L}+)?. In this case, the engine is now expecting either #foo or #foo_bar. If you need to match anything of the form: #foo_bar_hello, you can also use #\p{L}+([_]+\p{L}+)+.

Upvotes: 3

not working
not working

Reputation: 667

After tries to actually do what I want I found that the best solution is:

RegExp exp = new RegExp(r"([#][^\s#]*)");
  String str = "#الالاا_سيسيسشي_لأيبيبالابل";
  exp.allMatches(str).forEach((m) {
    print(
      m.group(0),
    );
  });

Upvotes: 3

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