How can I RegExp for Unicode Blocks in flutter/dart?

Question

I have some .NET RegExp code I am attempting to translate into Dart/Flutter. I see that Microsoft had some proprietary block names like "IsCJKSymbolsandPunctuation" but similar names exist here: https://www.regular-expressions.info/unicode.html#category. Nevertheless, both

    var something = "你好".replaceAll(RegExp(r"[\p{InCJK_Symbols_and_Punctuation}]", unicode: true), "");
    log(something);

and

    var something = "你好".replaceAll(RegExp(r"[\p{Han}]", unicode: true), "");
    log(something);

result in

My ultimate target is

//        r"\p{IsCJKSymbolsandPunctuation}\p{IsEnclosedCJKLettersandMonths}\p{IsCJKCompatibility}\p{IsCJKUnifiedIdeographsExtensionA}\p{IsCJKUnifiedIdeographs}\p{IsCJKCompatibilityIdeographs}\p{IsCJKCompatibilityForms}";

Is the only way to enter in code points?

You need `.replaceAll(RegExp(r"\p{Script=Hani}", unicode: true), "")` — Wiktor Stribiżew, Dec 01 '21 at 16:01
yes that's the answer, put it in the answers and I can approve it — tofutim, Dec 01 '21 at 16:37
None, the `Hani` is the code for the Han script, see https://unicodeplus.com/script/Hani — Wiktor Stribiżew, Dec 01 '21 at 19:22
it's missing chinese punctuation, i may have to go back to the blocks some how — tofutim, Dec 01 '21 at 20:12
Ok, [here](https://stackoverflow.com/questions/54179179/remove-all-spaces-between-chinese-words-with-regex/54179646#54179646) is all you need I think. — Wiktor Stribiżew, Dec 01 '21 at 20:13

score 0 · Accepted Answer · answered Dec 01 '21 at 17:11

You can use

var something = "你好".replaceAll(RegExp(r"\p{Script=Hani}", unicode: true), "");

\p{Script=Hani} will match any Chinese characters, same as \p{Han} in PCRE.

A Dart test:

String text = "Abc 123 - 你好!";
print(text.replaceAll(RegExp(r"\p{Script=Hani}", unicode: true), ""));

Output:

Abc 123 - !

How can I RegExp for Unicode Blocks in flutter/dart?

1 Answers1