Rule Not Working

[inkhead Profile]

I have a rule that works perfectly in the RegexTest but does not work when applied to the website.

Rule:
RewriteRule ^.*_pv-(\d*) /$1/ [NC]

Test String:
http://www.site.com/journals+organizers ... 895-0.html

Expected Result (Not Working):
http://www.site.com/19895/

This test string works however:
eco-spiral-notebook_pv-19895-0.html

Any idea what I'm doing wrong?

[inkhead Profile]

Issue was with a setting in IIS8

http://www.helicontech.com/articles/plus-sign-in-iis7/