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linux regular expressions: file name: lab3test.txt Create regular expressions that meet the following criteria. You may...

linux regular expressions:

file name: lab3test.txt

Create regular expressions that meet the following criteria. You may use grep or egrep to answer these questions

1.Match only the lines that contain an employee ID (and nothing else) with the format 12345.

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Answer #1 
A Regular expression followed by {m} matches exactly m occurrences of the preceding expression. The following grep command will display only the number which has 5 digits.

grep "^[0-9]\{5\}$" lab3test.txt

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