How to select a email in QTextEdit

[ng2b30]

I want to select the email in a QTextEdit widget and then highlight each email . But I found that select() funciton only support 4 types: Document, BlockUnderCursor, LineUnderCursor and WordUnderCursor.

So, is there any other way can only select an email?

My input example in QTextEdit is

email@abc.com , b@acb.com

I know that I can use QTextCursor to select the text .

QTextCursor tc = ui->textEdit->textCursor();
    tc.select(QTextCursor::WordUnderCursor);
    QString text = tc.selectedText();

QTextCursor tc = ui->textEdit->textCursor();
    tc.select(QTextCursor::WordUnderCursor);
    QString text = tc.selectedText();

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using email@abc.com, b@acb.com as an example, it would return email , abc, com , b , acb ,com.
I want to return the text like email@abc.com and b@acb.com.

How can I do that? Please give me some helps. Thanks!

[high_flyer]

I am not sure what you mean by "select".
Do you mean highlight it?
Or extract is from the rest of the text?
For both cases have a look at QRegExp http://doc.qt.io/qt-5/qregexp.html

[d_stranz]

For both cases have a look at QRegExp http://doc.qt.io/qt-5/qregexp.html

I looked at that, and the QRegularExpression equivalent for QTextDocument::find(). All of the find() methods return a QTextCursor pointing to the first position in the found string (if any). Then what? I think the OP is having the same problem that I could see at that point - there is no way to retrieve the full text fragment that was matched by the regexp and highlight (select) it. QTextCursor gives you four ways to select text: whole document, block under cursor, line under cursor, or word under cursor.

None of these will work for a URL - as I think the OP is seeing, "WordUnderCursor" breaks at the first non-character position, which is the "@" symbol in his examples.

So the bottom line question is, how do you find and highlight an arbitrary string in a QTextDocument?

[high_flyer]

I looked at that, and the QRegularExpression equivalent for QTextDocument::find(). All of the find() methods return a QTextCursor pointing to the first position in the found string (if any). Then what? I think the OP is having the same problem that I could see at that point - there is no way to retrieve the full text fragment that was matched by the regexp and highlight (select) it. QTextCursor gives you four ways to select text: whole document, block under cursor, line under cursor, or word under cursor.

It seems I have trouble understanding what the problem is...
In the case of a mail address, you could use the word under cursor option - don't you agree?

None of these will work for a URL - as I think the OP is seeing, "WordUnderCursor" breaks at the first non-character position, which is the "@" symbol in his examples.

Are you sure it's break at first non-character and not at first white space?
I don't have the time to check, but if you are right, I am very surprised.

So the bottom line question is, how do you find and highlight an arbitrary string in a QTextDocument?

OK, now that is a clear question! :-)

Did you guys have a look at QSyntaxHighlighter ?
I used it some years back and had no trouble highlighting text - but for any more details I will have to look in again...