get filetype / file extension

[Gintaras]

Member function str.GetFileExt

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function [$pathname]

;Gets filename extension.
;pathname - file name with or without path. Default: itself.

;EXAMPLE
;str s
;s.GetFileExt("c:\aaa\fff.eee")
;out s


if(!pathname) pathname=this

int i=findcr(pathname '\')+1
int j=findcr(pathname '.')+1
if(j>i) this.get(pathname j); this.trim("''")
else this=""