Originally Posted by Berserk

I think you need to make it this way:

Code:

QRegExp regexer("^\\#[0-9a-fA-F]{6,6}$");

^ = from the start of the string
(.. your characters ..)
$ = until the end of the string

Also, you might consider this:

Code:

ui->line_edit_font1->setValidator(new QRegExpValidator(regexer, ui->line_edit_font1);

I think the parent is wrong, you have it on "this", which is the whole class, I think you need to put it on the QLineEdits specifically.
Edit: this way, you don't have to make "actualvalidator".