Fix regex for expressions

Previously \S was used in these two cases which means any character except white-spaces (see http://regexlib.com/CheatSheet.aspx?AspxAutoDetectCookieSupport=1). This means that also single quote characters were selected, as for example in the case `name = 'test)'. I changed the regexp to also exclude the single quote character.

This should fix https://github.com/haf/DotNetZip.Semverd/issues/20