Different syntax behavior in vim 7.4

Hello,
I see a syntax behavior change between vim 7.4 and earlier version. (We are yet to update VIM version to 8.0+ in our company.)

I use different syntax for lines that begin with "//" (Comments) and lines that begin with "//:" (embedded Perl Code). I was able to achieve this with earlier version of vim by specifying this in the syntax file,

syn match embPerlCode "^\s*//:.*"

and this in .gvimrc,

highlight embPerlCode gui=bold guifg=maroon

This works fine in version 7.2 (didn't check in 7.3). But in version 7.4 the behavior has changed. The embPerlCode lines are shown with syntax color of Comments.

Is there a way to get around this and get back the previous behavior?

thanks,
Chandra

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