What does dgrep do 

• in our example

$ dgrep -t mason dateFormat
secure/promo/index.html:            jQuery(".datepicker").datepicker({ dateFormat: 'd M yy' });

• cf. ack

$ ack --html dateFormat
secure/promo/index.html
131:            jQuery(".datepicker").datepicker({ dateFormat: 'd M yy' });

• which is better than

$ find . -regextype posix-extended -type f -regex '.*\.(html|comp|mhtml|autohandler|syshandler|dhandler)$' | xargs grep 'dateFormat'