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https://issues.apache.org/jira/browse/LANG-1038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14244883#comment-14244883
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Bernd Eckenfels commented on LANG-1038:
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If you ask me this method is broken beond repair. It was never clearly defined
what is a number and therefore we have conflicting ideas. We seen that in the
past with ranges, digits, signs, octal/hex prefix and so on.
> NumberUtils#isNumber() returns false for "+2" and true for "-2"
> ---------------------------------------------------------------
>
> Key: LANG-1038
> URL: https://issues.apache.org/jira/browse/LANG-1038
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.math.*
> Affects Versions: 3.1, 3.3.2
> Reporter: will mason
> Fix For: Discussion
>
>
> The strings {{"\+2"}} and {{"\+ 2"}} give a "False" result when tested by
> {{isNumber()}}.
> Case one, {{"\+2"}} is legal with {{Integer.parseInt()}}. Case two: {{"\+
> 2"}} gives an exception with {{Integer.parseInt()}}.
> I believe the function should match legitimate inputs for the respective
> parser function depending on the number type.
> Workaround: Use something like:
> {code:java}
> NumberUtils.isNumber( wrkStr.replaceFirst( "\\+", "") )
> {code}
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