[LANG-1038] NumberUtils#isNumber() returns false for "+2" and true for "-2" - ASF JIRA

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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:

NumberUtils.isNumber( wrkStr.replaceFirst( "\\+", "") )

is blocked by

LANG-1040 Javadoc for NumberUtils.isNumber() are not clear enough

is related to

LANG-1252 NumberUtils.isNumber and NumberUtils.createNumber resolve inconsistently

relates to

LANG-1252 NumberUtils.isNumber and NumberUtils.createNumber resolve inconsistently