Use unix grep to conduct a web search on a static site

the web server code would have to execute the command-line program

grep -R --exclude-dir=versions --include='*.txt' "Test Post 8Apr2016 1130" .

the search would start in document root.

check string to permit only alphanumeric, underscore, and hyphen. maybe the period.

http://www.perlmonks.org/bare/?node_id=114642

Examples

@ grep -i -R --exclude-dir=versions --include='*.txt' "4APR2016" .@

./note-4apr2016-2102-edt.txt:# Note: 4Apr2016 2102 EDT
./2016/04/04/test-post-4apr2016-1312.txt:# test post 4apr2016 1312
./2016/04/04/test-1313.txt:# test post 4apr2016 1313
./index.txt:* [Note: 4Apr2016 2102 EDT](/note-4apr2016-2102-edt.html)
./tag-note.txt:* [Note: 4Apr2016 2102 EDT](/note-4apr2016-2102-edt.html)

grep -i -R --exclude-dir=versions --include='*.txt' "comet" .

./2016/04/17/test-post-17apr2016-2103.txt:this is a sentence that mentions my old cat Comet.
./2016/04/17/test-post-17apr2016-2103.txt:asf jlajsflja lfjal fjla jf  lja sf af but this one does mention COMET again, along with some gibberish text a ljaslfj al ksjflkaj fja lja fjalf jal fjalj flaj fl jalf jlaj fll ajsf jl fjljf 
./2016/04/17/test-post-17apr2016-2103.txt:finally, i miss comet who passed away in May 2010 at the age of 18-years-old. almost six years ago already. 

if want to stop the search on each file after only one match, then add the -m 1

grep -i -R -m 1 --exclude-dir=versions --include='*.txt' "comet" .

Only the first hit will get displayed.