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    Nosrettap is offline Member
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    Default What does the following expression mean "\\+"

    What does the following expression mean "\\+" ? It's either a normal expression or a regular expression...thanks

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    doWhile is offline Moderator
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    Regular expression quantifier (Quantifiers (The Java™ Tutorials > Essential Classes > Regular Expressions)), typically meaning one or more times of the previous character, char class, etc...

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    Quote Originally Posted by doWhile View Post
    Regular expression quantifier (Quantifiers (The Java™ Tutorials > Essential Classes > Regular Expressions)), typically meaning one or more times of the previous character, char class, etc...
    Yep, but not here because the plus sign has been escaped; two backslashes are used because \+ doesn't make sense to javac (the Java compiler), i.e. the backslash itself needs to be escaped as well: \\+

    Javac will pass \\+ as \+ to the regular expression compiler; it will use the backslash to escape the plus sign resulting in an ordinary character + without any special meaning to the regular expression engine.

    kind regards,

    Jos
    cenosillicaphobia: the fear for an empty beer glass

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