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$ echo 'abc def' | nawk '{printf("[%-12s][%-15s]\n", $1, $2)}'
[abc ][def ]

Try using the \b word boundries like this:
egrep "\ba\b|\bword\b" files

You can simply add html tags in your echo statements.
Don't forget to add echo statements for header and footer.
If you use variables for the tags, you can choose between plain text or html by...

There are may ways to accomplish that.

One way would be like frans already suggested, I fully agree with him.
One could also afterwards create a html with appropriate awk/sed commands from the...

Perhaps the debug output line should have been:

echo egrep \""${ARR
}"\" $FILE

Giving:$ ./script.sh

egrep "a|b|c|d" file1
egrep "e|f" file2
egrep "g|h|i|j|k|l" file3

$

That doesn't work because "a|b|c" is not in quotes. It has to be, or the shell assumes you're running egrep a | b | c

It freezes because 'egrep a' is not given a filename and tries to read from...

Give a try with :
awk -v d1="${date1}" -v d2="${date2}" '$0~d1{p=1} $0~d2{p=0} p' test.log >> tmp.log