UNIX for Dummies Questions & Answers

Hello!

I have a question about how to combine patterns in grep commands with the OR operator.

So I have this little assignment here:

Provide a regular expression that matches email addresses for San Jose City College faculty. A San Jose City college faculty’s email address takes the form:
<only first letter of first name><last name>@sanjosecity.edu or
<only first letter of first name><last name>@sjcc.edu
The letters for first name and last name are all lower case letters. Last name must contain at least one (or more) letter. Examples: bloo@sanjosecity.edu or bloo@sjcc.edu

So I came up with two separate grep commands:

Code:

grep '^[a-z]\{2,\}\@sjcc\.edu$' file.txt

and

Code:

grep '^[a-z]\{2,\}\@sanjosecity\.edu$' file.txt

But I have no idea how to combine them together!! I tried using the OR operator, the | , but it would not give me the correct result. It would ignore the "sanjosecity" pattern, and just satisfy the "sjcc" one.

How do I combine the patterns successfully, while still making sure that either way, the email is all lower case letters? (NO NUMBERS!)

Any help would be greatly appreciated!!
I'm preparing for my final tomorrow and I'm getting nervous because I can't seem to solve this

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