White space regex

[Rakoczi Markus]

Hello

I not experienced with regex expresions, and i want to check if a textfield contains white spaces, so i read the textfield content and matches with a regex expression
for example:

final static String WHITE_SPACES = "\\s*";
textFieldContent.matches(WHITE_SPACES);

is my regex expression complete enough to check for any posibile white space content?

Thanks.

[Mansukhdeep Thind]

Try it out and see what you get. Then try and understand why you get what you get.

[Winston Gutkowski]

Rakoczi Markus wrote:I not experienced with regex expresions, and i want to check if a textfield contains white spaces, so i read the textfield content and matches with a regex expression

Well, first: Do you want to know if the field contains ANY whitespace or if it contains ONLY whitespace?

Because:

1. You should look up the API documentation for String.matches(), and make sure that it's really what you want.

2. '*' means "0 or more"; and that '0' is very important.

You should probably also look at the java.util.regex.Pattern and java.util.regex.Matcher classes.

There's a fair bit to know about regexes, and you can't learn it overnight.

Winston

[Campbell Ritchie]

Go through the Pattern class, or the Java Tutorials.
Look for \s and *