CODEWITHSUNDEEP
java
AnnieOK
AnnieOK

Reputation: 1390

Character.IsWhiteSpace explanation

I was asked to split a string by all chars where Character.IsWhiteSpace = true.

Does Character.IsWhiteSpace equivalent to:

c == " " || c == "\t" || c == "\r" || c == "\n"

EDIT:
I'd be glad if you could help think of a neat way to slpit a text by this criteria.

Upvotes: 1

Views: 930

Answers (2)

assylias
assylias

Reputation: 328735

The easiest way to split on such characters is:

String[] words = input.split("\\p{javaWhitespace}+");

It is documented in the Pattern javadoc:

\p{javaWhitespace} Equivalent to java.lang.Character.isWhitespace()

In particular, splitting on \\s is not equivalent because it will not split on \u001C...\u001F.

Upvotes: 1

pzaenger
pzaenger

Reputation: 11994

Here you can read more about it.

Taken from there:

Determines if the specified character is white space according to Java. A character is a Java whitespace character if and only if it satisfies one of the following criteria:

It is a Unicode space character (SPACE_SEPARATOR, LINE_SEPARATOR, or PARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0', '\u2007', '\u202F').
It is '\t', U+0009 HORIZONTAL TABULATION.
It is '\n', U+000A LINE FEED.
It is '\u000B', U+000B VERTICAL TABULATION.
It is '\f', U+000C FORM FEED.
It is '\r', U+000D CARRIAGE RETURN.
It is '\u001C', U+001C FILE SEPARATOR.
It is '\u001D', U+001D GROUP SEPARATOR.
It is '\u001E', U+001E RECORD SEPARATOR.
It is '\u001F', U+001F UNIT SEPARATOR.

Upvotes: 3

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