Find QRegExp in the text
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Hellow, i need find some RegExp construction in the QPlainTextEdit, i try do it
@ QTextCursor curs;
curs.setPosition(-1);
if (plainTextEdit->document()->find(QRegExp("{. }"))!=curs)
listWidget->addItem("empty stylesheet {it's empty!}");@
I want if there are { } in the text that program add item in the listWidget.
I think that i wrong chek position in the if(), can you say me how can chek this position right way
Advance many thanks for your help!
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try
@if (!plainTextEdit->document()->find(QRegExp("{. }")).isNull()))
listWidget->addItem(...);@
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Dont work:(
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Might the cursor then be at the document end?
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Curly brackets have a special meaning in regular expressions. You need to escape them like this:
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QRegExp re("\{. \}");
@
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I find my mistake
@ if (!plainTextEdit->document()->find(QRegExp("\{ *\}")).isNull())
listWidget->addItem("empty stylesheet {it's empty!}");@
And code work, but it is not work with sign of new string(\n), how can i modif my QRegExp to my code work, i try@
QRegExp("\{[ \Z]\}"))
QRegExp("\{[ \Z]\}"))
@And instead Z i try use A
All does not work[EDIT: wrap your code!, Volker]
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I also try QRegExp(”\{[ \n]*\}”))
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AFAIK you can apply a regular expression in a single text block only. That is you cannot use \n notation with your regexp. I remember that in my homework I had to break my expression to two expressions to do that. I didn't found a way to use a regexp with two paragraphs in QPlainTextEdit....
you can use "this tool":http://sourceforge.net/projects/regexer to test regular expressions in Qt.
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But there are operators \A and \Z - start and end of string in the QRegExp, so in QRegExp must work with it
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[quote author="Ruzik" date="1307644633"]I also try
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QRegExp(”\{[ \n]*\}”))[/quote]
@[EDIT: code formatting! Volker]
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QRegExp works with \n and so on but in QPlainTextEdit it's applied on a text block. not whole contents of QPlainTextEdit. you probably need to break your expression or use that on the QPlainTextEdit::toPlainText() to find begin and end indexes.
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The search pattern is only applied for a text block. The pattern can not cross a text block boundary! See method static bool findInBlock() around line 1290 in qtextdocument.cpp of the Qt sources.
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The answers above explain a problem I came to ask about, so thank you. However, in the general case of a user-entered pattern I do not see any way of getting around this bad restriction.
Suppose the pattern (example from QRegExp documentation) is <b>.*</b>, this cannot succeed when the document is:
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some text or <b>bold
text</b> other etc.
@You could examine the user's pattern and change it into:
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<b>.$
^.</b>
@But that would fail for the case of <b>on one line</b> and also would fail for the case of a target spanning three or more lines. In short I see no work-around for the general case of patterns matching across multiple lines. Comment?
