git - Github search using regex -

is there way search code in github repo using regular expressions?

currently, clone repo , search.

but want type like

s/foo/gi 

and find occurances of foo in code:

foo.create foo.extend foobar barfoo bar.foo 

is possible? missing in docs?

since it's git repo, why not clone locally, , use git grep 1 of it's regex options?:

git grep [-w | --word-regexp]          [-e | --extended-regexp] [-g | --basic-regexp]          [-p | --perl-regexp] 

so maybe along lines of

$ git clone repo $ git grep -w foo