Mod rewrite help

Hi all,

I have a requirement to change all underscores to dashes, well I have achieved that with these two lines:
RewriteRule ^([^_]*)_(.*)$ /$1-$2 [R=301,L]
RewriteRule ^([^_]*)_([^_]*)$ /$1-$2 [L,R=301]

However now I need to restrict these rules to only apply to a certain page "help.php" (its in the root directory)

I thought this might do the trick:

<If "%{REQUEST_FILENAME} ^help/.php$">
RewriteRule ^([^_]*)_(.*)$ /$1-$2 [R=301,L]
RewriteRule ^([^_]*)_([^_]*)$ /$1-$2 [L,R=301]
</If>...

Mod rewrite help

from Apache https://ift.tt/36EAXtE
via IFTTT