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You can use match to create what you whant.
sno="^[0-9]{1,2}$"
awk --posix 'match($1,p1){print}' p1=$sno
You can then make a script that reads variable from a file and use it in awk
This is just...

File that have the data you like to validate.
I have all definition in awk, not a separate file.

---------- Post updated at 09:27 ---------- Previous update was at 09:18 ----------

Some like...

ls custpoten_*.txt > sample_txt_files

while read line
do
srcfile="/ushhquest/data001/SrcFiles/"$line
tgtfile=/ushhquest/data001/SrcFiles/output.txt
awk -F, '$6 == 5 {next}1' $srcfile...

awk -F, '$6 == 5 {next}1' viv.txt > output

Or just awk -F"," '$6 != 5'

A bare expression like that is an implied "if such-and-such, then print", like { if($6 != 5) { print } }