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Thread: Match the text beetween two string

  1. #1
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    Question Match the text beetween two string

    I have a text file and i'd like to import just the characters beetween two string:

    #####START TEXT id1
    Some Text.........bla bla bla.
    Bla bla bla.
    Bla bla bla.
    #####END TEXT id1

    some other text
    some other text
    some other text

    #####START TEXT id2
    Some Text.........bla bla bla.
    Bla bla bla.
    Bla bla bla.
    #####END TEXT id2

    The parser has to print, the text beetween #####START... and ######END.... and also has to know the number id(that is an integer)

    How can i obtain this behaviour? Perhaps i guess with QRegExp.....but how????

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    Default Re: Match the text beetween two string

    You can simply read line by line to QString, then use QString::contains() to check if it contains #####START TEXT or #####END TEXT
    Taking out id number from end of QString is simple too i think.
    You have to run a level 3 diagnostic.

    Ashes to ashes, Qt to Qt ( wysota )

  3. #3
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    Default Re: Match the text beetween two string

    Taking out id number from end of QString is simple too i think.
    How can i take it?
    I don't know if it has one(0-9) or two(0-99) or three digits(0-999) digits.........i guess in this case, i have to use a regexp..........

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    Default Re: Match the text beetween two string

    after you get line that contain "#####START TEXT id1"
    use remove( "#####START TEXT id" )

  5. #5
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    Default Re: Match the text beetween two string

    There are many ways to do it. QString::toInt() can convert a string to a number. You can use QString::lastIndexOf() or similar to find position of the last whitespace in the line and treat the rest as the number. Or you can use a regular expression.

    Qt Code:
    1. QRegExp rx("#####START TEXT (\d+)");
    2. while(file.canReadLine()){
    3. QString line = file.readLine();
    4. if(rx.exactMatch(line)){
    5. qDebug() << "STARTING TAG WITH ID" << rx.cap(1);
    6. }
    7. }
    To copy to clipboard, switch view to plain text mode 

    Besides, you know how many characters the "preamble" has (16), so you can read the id directly from the position it should start on.

    Qt Code:
    1. int id = line.mid(16).toInt();
    To copy to clipboard, switch view to plain text mode 

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