Find files containing "foo" and print the files with highlighted matches
$ pt [foo]
Find files containing "foo" and display count of matches in each file
$ pt -c [foo]
Find files containing "foo" as a whole word and ignore its case
$ pt -wi [foo]
Find "foo" in files with a given extension using a regular expression
$ pt -G='[\.bar$]' [foo]
Find files whose contents match the regular expression, up to 2 directories deep
$ pt --depth= -e '[^ba[rz]*$]'
This is the group of Positive Definite tridiagonal routines
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