Trying to figure out the PCRE expression for Nagiosgraph Map

I'm writing a pcre rule for a nagios map file.

The output for one query would be:

PROCS OK: 11 processes with args 'apache'

What would the map rule look like that would do the following?

1. Begin with "PROCS OK:"
2. End with "args 'apache'"
3. Extract only the numeric value before the word processes?

Assuming it would be a nested regex within the regex.

So basically, the map regex would only return 11, but enforce the rules 
above?

Just trying to understand the logic behind this.

Thanks.

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