Michael Schoell 1169477ed4 Can use unicode characters in Math Expression nodes. All unicode "letters" are now allowed for variable/input/output names. This does not extend to symbols and only the underscore symbol is still allowed. ...

Added FText::IsLetter to check a TCHAR to see if it is a letter according to ICU.

#jira UE-17396 - Math Expression Node does not support unicode variable names

[CL 2606453 by Michael Schoell in Main branch]

2015-06-30 17:02:10 -04:00

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