What is the difference between -E and -e in grep in Kali Linux?

KALIAK

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What is the difference between -E and -e in grep in Kali Linux? Because both are for regexp so which one is better to use and why? And the difference between both.
 


This isn't just a Kali thing, but...

The -e only lets me use one pattern after it. I can use -e twice or more if I want more patterns.
Code:
grep -e "pattern1" -e "pattern2" file.txt

If I use the -E option, I can use multiple patterns.
Code:
grep -E "pattern1|pattern2" file.txt

So not really a lot of difference, just slightly less typing the second way.
 
This isn't just a Kali thing, but...

The -e only lets me use one pattern after it. I can use -e twice or more if I want more patterns.
Code:
grep -e "pattern1" -e "pattern2" file.txt

If I use the -E option, I can use multiple patterns.
Code:
grep -E "pattern1|pattern2" file.txt

So not really a lot of difference, just slightly less typing the second way.
Thanks for clarifying my thought
 


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