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Thread: How to check whether the string contains only the specified characters ????

  1. #1
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    Default How to check whether the string contains only the specified characters ????

    Hi,

    I may get more than 1000 lines in a file. Each line ends with a new line character. Sometimes the file may have 4 lines.
    Other lines will have characters such as , : alone.

    I'm storing each line in the database if it is a valid line and If the line contains only the above characters (, : ) i need to skip the line and doesn't want to save.

    Example Input,

    Allows you to work and play in a secure computing environment.
    ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
    Allows you to play online
    :::::::::::::::::::::::::::::::::::::::::::::::::: :::::::::::::::::::::::::::::::::::::::::::::

    Lines Saved:
    Allows you to work and play in a secure computing environment.
    Allows you to play online

    Currently what i'm skipping the line if it has the above characters as below

    Pattern.compile([,:+ ])
    Matcher matcher = pattern.matcher(string);
    String tmp = matcher.replaceAll("")
    if(tmp.length > 0 ) {
    /// Skip
    }

    Is there is any other way to do instead of calling replaceAll ??

    I like to know whether is there is any other way to check whether the string contains only those characters and nothing else, so that i can directly skip
    instead of calling replaceAll and checking for length?

    any pattern or regular expression which should say the line contains only those characters and nothing else, so we can skip the line.

    Please help.

    Thanks,
    Kathir


  2. #2
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    Default Re: How to check whether the string contains only the specified characters ????

    Please post your code for us to see..

    You could use an 'if' statement to see if the String contains the unwanted characters, If it does, skip, else.. write to file.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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    Default Re: How to check whether the string contains only the specified characters ????

    I should skip the line if the string contains "ONLY" the unwanted characters...

    If the line has some characters and unwanted characters..then it is fine..

    Ex:

    Programming languae,,,,,,, --> Accepted
    ,,,,,,,,,,,, --> Rejected
    This , + : comes with a --> Accepted

    Please let me know.

    Thanks,
    Kathir

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    Default Re: How to check whether the string contains only the specified characters ????

    The following regular expressions should work
    if ( string.matches("[,;]*") ){
    //skip
    }

    This will also skip empty lines as well, so change the '*' to a '+' if you do not want to skip those for whatever reason

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