Parsing Strings

Suppose there is a series of lines consisting of email ids. In case we want to find out the university email ids in a group of various email ids consisting of both Gmail and university ids. For eg,

data1 = "someone@gmail.com"

Basically, we will check if there is a substring starting with @gmail

We can do this by using the find method .

position = data1.find('@gmail')

The index of @ i.e, 7 gets assigned to the position. It means it has the substring that we are searching for. If the substring is not present it returns -1.

If we have some other information on the line along with email id, we can slice it off using the technique discussed earlier, since we have the position of @ we can find the position of any blank space before and after @ if present and extract the email id out.

We can also mention the position from where we want the find function to start searching. For eg,

position = data1.find('@gmail', 4, 6)

It will search from the index 4 up to index 6.

If we do not mention anything, find returns the position of the substring that occurs for the first time.

INSTRUCTIONS

Define a function with the name email_func that takes a str argument and extracts out and returns the first email id. If there is no email id present return False.
Return only if there is valid email id. An email id is valid if at least one @ is present in it and no blank spaces. Else, you can return the boolean False. We are keeping the requirement for a valid email simple, requiring only one '@' in it. We do not want you to write an exhaustive check for valid email here.

Example 1 - Input email_func("Crazy Frog") - Output It should return False

Example 2 - Input email_func("this is first abhinav@cloudxlab.com and this is second sandeep@cloudxlab.com") - Output abhinav@cloudxlab.com

Example 3 - Input email_func("a a@") - Output a@

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Foundations of Python

Parsing Strings

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