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Find Files With Certain Extensions
Searches the current directory and deeper for several extensions. In this example both files mathing 'php', 'html' and 'tpl' match the search.
find ./ -regex ".*\(php\|html\|tpl\)$"
As an alternative you could also use:
find ./ -iname "*.php" -or -iname "*.tpl" -or -iname "*.html"