detect gmail adress using REGEX with python

Question

so i want to detect email with some specific conditions

1. start with letter or number [0-9a-zA-Z]
2. before the @ it have to be also a letter or a number [0-9a-zA-Z]
3. the email can contain a point in the middle of it but can't contain more than 1 point for example [email protected] is correct but [email protected] is not correct
4. condition the email have to contain 6 minimum until 30 characters maximum

emailText='[email protected] [email protected]'

emailRegex=re.compile(r'[^.][0-9a-z]+[\.]?[0-9a-z][email protected]',re.I)
matchEmail=emailRegex.findall(emailText)
print(matchEmail)

I expected that it will detect only the 2nd email [email protected] but it detected also a part of the 1st email [email protected]

Answer 1

A basic email regex is built into HTML5, and uses the following expression:

<input type="email" name="email" pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}$" />

This regex will match most common email formats, but it has some limitations. For example, it does not allow uppercase letters or special characters like “+” or “=” in the local part of the email (before the “@”). It also does not check for valid top-level domains (TLDs) like “.com” or “.org”.

If you want a more complex and accurate regex for email validation, you can use this one2:

<input type="email" name="email" pattern="(?=.{6,30}$)(?=[a-zA-Z0-9][\w.-]*@)[\w.-]+(?<=@)[a-zA-Z0-9][\w.-]*\.[a-zA-Z]{2,}" />

This regex will match emails that:

• have 6 to 30 characters in total
• start with a letter or a digit
• have only letters, digits, dots, hyphens or underscores in the local part
• have only one dot in the local part
• have at least one dot after the “@”
• end with a TLD of at least two letters

Using this regex on your emailText variable will only match “[email protected]”, as expected.

Also

import re

emailText = '[email protected] [email protected]'
emailRegex = re.compile(r'^[0-9a-zA-Z][0-9a-zA-Z\.]{4,28}[0-9a-zA-Z]@[0-9a-zA-Z][0-9a-zA-Z\.]*[0-9a-zA-Z]$')
matchEmail = emailRegex.findall(emailText)
print(matchEmail)

I hope this helps you with your task. Good luck!

Answer 2

import re

r = re.compile(r"([-!#-'*+/-9=?A-Z^-~]+(\.[-!#-'*+/-9=?A-Z^-~]+)*|\"([]!#-[^-~ \t]|(\\[\t -~]))+\")@([-!#-'*+/-9=?A-Z^-~]+(\.[-!#-'*+/-9=?A-Z^-~]+)*|\[[\t -Z^-~]*])")

def isValid(email):
    if re.fullmatch(r, email):
        print("Valid")
    else:
        print("Invalid")

isValid('[email protected]')
#Valid

isValid('[email protected]')
#Invalid

Please let me know if this is working fine.

Answer 3

so using some part of the previous answer i finally get the results that i wanted thanks to everyone

import re
    
    emailText = '[email protected]. adel [email protected]  [email protected] [email protected];adeee :[email protected] [email protected]'
    emailRegex = re.compile(r'[\^|\^\w][0-9a-zA-Z][0-9a-zA-Z\.]{4,28}[0-9a-zA-Z]@[0-9a-zA-Z][0-9a-zA-Z]*\.[0-9a-zA-Z]{1,4}[\$|\^\w]')
    matchEmail = emailRegex.findall(emailText)
    print(matchEmail)