https://issues.apache.org/bugzilla/show_bug.cgi?id=49640

           Summary: [PATCH] FormulaParser cannot parse formulas containing
                    defined names beginning with an underscore
           Product: POI
           Version: 3.7-dev
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: POI Overall
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Created an attachment (id=25795)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=25795)
Fixes incorrect rejection of defined names beginning with underscores in
formulas

Eclipse allows defined names to begin with either a letter or an underscore. 
These defined names may be present in a formula (e.g. =SUM(F15:F16)+_GP108). 
In the previous example _GP108 is a defined name beginning with an underscore.  

FormulaParser fails to process the defined name in the previous example because
the parseNonRange(int) function only tests whether the defined name begins with
a letter.  This occurs when processing xssf workbooks only.

The attached patch modifies the test for the defined name starting character to
accept underscores.

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