2. Write down the extended regular expression for following questions E.g. Socia

Question

2. Write down the extended regular expression for following questions
E.g. Social security number in the format of 999-99-9999.
Answer: [0-9]{3}-[0-9]{2}-[0-9]{4}                   (10 points, each 2 points)

1) Valid URL beginning with “http://”. (e.g. https://www.oakland.edu)

2) Valid variable name following the two rules below: Must begin with a letter of the alphabet, an underscore, or ( _ ), or a dollar sign ($) After the first initial letter, variable names may also contain letters and the digits 0 to 9.
3) Valid email address, assuming ‘ a-z’,’0-9’,’_‘,’.’ are valid characters for user id and domain name has to be end with either “.com” or “.net” (e.g. aabb_123.xy@g3.com, cdcd@12_3.net)

4) Phone number in any of the following format: 999-9999999,999999-9999, (999)-9999999. (Note: all of these formats should be matched by a single regular expression)

5) Valid HTML link tag with the format: <a … > ... </a> . (e.g. <a href="http://www.oreilly.com"> O’Reilly Media </a> ,               <a href="/file/test.txt"> Download Test </a> )

I JUST NEED 2 AND 4!

Explanation / Answer

1. http://[a-zA-Z0-9.-]*
Examples
http://www.chegg.com
http://www.oakland.edu

2. [a-zA-Z_$][a-zA-Z_$0-9]*
Examples
chegg34_underscore
_1chegg
$chegg12

3. [a-z0-9_.]*@[a-z0-9_.]*[.com|.net]
Examples
aabb_123.xy@g3.com
cdcd@12_3.net

4. ([0-9]{3}-[0-9]{7})|([0-9]{6}-[0-9]{4})|(([0-9]{3})-[0-9]{7})
Examples
999-9999999
999999-9999
(999)-9999999.

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