searching string using grep

Question

I am searching a string using grep but the output displays unwanted files along with the correct file.

Ex:- xyz_utils.c Contains SAM22 keyword.

grep command:

ret=$(grep -irwE "${excluded_files[@]/#/--exclude=}" "\\b${LIST[$A]}\\b|${LIST[$A]}[-_.*>@^:.,~%&\(\)\{}]|\\b${LIST[$A]}\\b" \
                "$package/" |grep -v "$filters\|${excluded_dir[@]}" -c)

LIST[] -> Contains the list of words needs to be searched for.

Unwanted files displayed:

/home/sampath/SAM20_1.0.0/LICENSE.BSD:      from this software without specific prior written permission.
/home/sampath/SAM20_1.0.0/LICENSE.BSD:  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
/home/sampath/SAM20_1.0.0/LICENSE.BSD:  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
/home/sampath/SAM20_1.0.0/LICENSE.BSD:  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
/home/sampath/SAM20_1.0.0/LICENSE.BSD:  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
/home/sampath/SAM20_1.0.0/LICENSE.BSD:  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.
.
/home/sampath/SAM20_1.0.0/README.txt:    Static libraries included in SAM software package:
/home/sampath/SAM20_1.0.0/README.txt:        Warning: This option should never be enabled in a production environment
.
.

Correct file displayed:

/home/sampath/SAM20_1.0.0/xyz_utils.c:SAM22

Answer 1

If I want to search for a string, like SAM22 , within a group of files, this is what I do:

find /<directory> -name "*.<extension>" -exec grep "SAM22" {} /dev/null \;

For your information: /dev/null is a neat trick: as you might know, grep "entry" <filename> shows entry as a result (no filename), while grep "entry" <filename1> <filename2> shows filename1:entry , so by adding /dev/null , I can force the output to show the filename too.
In case you say "I don't need the whole line, containing SAM22 , just the entry itself, this can be handled using the -o switch:

find /<directory> -name "*.<extension>" -exec grep -o "SAM22" {} /dev/null \;