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Thread: Splitting string in Java error

  1. #1
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    Default Splitting string in Java error

    Hello I am currently trying to split the string "EAM\test" between the \ part. I have gotten the code to work if the \ was a -. But I can't see why the error is occuring

    I have tried

    String test = "EAM-testing";
    String[] parts = test.split("-");
    System.out.println("parts[0] = " + parts[0]);
    System.out.println("parts[1] = " + parts[1]);
    String test1 = "EAM\testing";
    String[] parts1= test1.split("\\");
    System.out.println("parts1[0] = " + parts1[0]);
    System.out.println("parts1[1] = " + parts1[1]);

    The output I see is:
    parts[0] = EAM
    parts[1] = testing
    java.util.regex.PatternSyntaxException: Unexpected internal error near index 1
    \
    ^
    at java.util.regex.Pattern.error(Unknown Source)
    at java.util.regex.Pattern.compile(Unknown Source)
    at java.util.regex.Pattern.<init>(Unknown Source)
    at java.util.regex.Pattern.compile(Unknown Source)
    at java.lang.String.split(Unknown Source)
    at java.lang.String.split(Unknown Source)

    The error occurs at line: String[] parts1= test1.split("\\");


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    Default Re: Splitting string in Java error

    Because the split method works with regular expressions. The String "\" is not a valid regular expression because the "\" is the escape character for regular expressions in java.
    Try to use "\\" instead.

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    Default Re: Splitting string in Java error

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

    Please post your code correctly per the above link.

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    Default Re: Splitting string in Java error

    Hai Scoobs ,
    In the code, String test1 contains "\" expression. but in the split function of string parts1 contains "//" expression.
    So change it.. it ll work..

    Nijan
    Last edited by copeg; July 28th, 2014 at 02:07 PM. Reason: Removed prmotional links

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    Default Re: Splitting string in Java error

    The issue is also that the \t in your test1 String object is becoming a tab. As Cornix said, .split() uses a regular expression as a parameter, so it expects something after the escaped backslash. In this case, using "\\s" should work (in regex, \s matches whitespace characters), as it will split the tab created in your String and give you the following output:
    parts1[0] = EAM
    parts1[1] = esting

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