match //[flags] - explanation

I am extending the SyntaxComplete (http://www.vim.org/scripts/script.php?script_id=3172) plugin (it is included in Vim's runtime).

I have noticed the Perl plugin uses some unusual syntax for the syntax rules.  I was hoping to extend it to handle these types of match statements.

Here is one of it's uses:

perlFiledescStatementNocomma xxx match /(\=\s*\u\w*\s*[^, \t]/me=e-1  contained transparent contains=perlFiledescStatement 

The part I am concerned about is the /me=e-1.

I am trying to understand what it is doing and where I can read up on it in the Vim documentation.

Looking at changes.txt specifically  h :s_flags, it looks like there are the following flags:

[&]

[c]

[e]

[g]

[i]

[I]

[n]

[p]

[#]

[l]

[r]

I don't see the [m] flag and am not sure what the =e-1 does.

Looking at:

*:mat* *:match*

:mat[ch] {group} /{pattern}/

This doesn't show any flags (like /me) can be added to the match command.

Any insight would we welcome.

TIA,

David

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