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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.
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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