regex - Vim Error E488: Trailing characters on substitution with gn flags -


i trying count occurrences of regex in vim following command: 

:%s/class=//gn

or even: 

:%s/class=/&/gn

but keep getting e488: trailing characters. suggested in official documentation http://vimdoc.sourceforge.net/htmldoc/tips.html#count-items

can help/explain ? way have found out working :%s/class=/&/g in opinion little overkill since substitutes regex same characters tat have been found instead of counting occurrences.

i using vim 6.3

after searching found in :help improvements-7:

to count items (pattern matches) without changing buffer 'n' flag has been added :substitute.

thus have upgrade 7.0 @ least. :-)


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