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explain whitespace pattern 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1407537 13f79535-47bb-0310-9956-ffa450edef68
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Matthew Jason Benson 2012-11-09 16:50:39 +00:00
parent fa4ed70023
commit 8a946932c8
1 changed files with 5 additions and 0 deletions
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5
src/main/java/org/apache/commons/lang3/StringUtils.java
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@ -150,6 +150,11 @@ public class StringUtils {
/** /**
* A regex pattern for recognizing blocks of whitespace characters. * A regex pattern for recognizing blocks of whitespace characters.
* The apparent convolutedness of the pattern serves the purpose of
* ignoring "blocks" consisting of only a single space: the pattern
* is used only to normalize whitespace, condensing "blocks" down to a
* single space, thus matching the same would likely cause a great
* many noop replacements.
*/ */
private static final Pattern WHITESPACE_PATTERN = Pattern.compile("(?: \\s|[\\s&&[^ ]])\\s*"); private static final Pattern WHITESPACE_PATTERN = Pattern.compile("(?: \\s|[\\s&&[^ ]])\\s*");