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  1. Prepare
  2. Python
  3. Python Functionals
  4. Validating Email Addresses With a Filter
  5. Discussions

Validating Email Addresses With a Filter

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620 Discussions

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  • varthyasandeep
     + 0 comments
    import string

def fun(s):
    try:
        username, website_extention = s.split("@")
        website, extention = website_extention.split(".")
    except ValueError:
        return False
    
    # Fix: reject empty parts
    if not username or not website or not extention:
        return False

    allowed_username = string.ascii_letters + string.digits + "_-"
    allowed_website = string.ascii_letters + string.digits

    for c in username:
        if c not in allowed_username:
            return False

    for c in website:
        if c not in allowed_website:
            return False

    if not extention.isalpha() or len(extention) > 3:
        return False

    return True

  • vinay_araveti
     + 0 comments
    import re

EMAIL_REGEX = re.compile("^[a-zA-Z0-9_-]+@[a-zA-Z0-9]+\.[a-zA-Z]{1,3}$")

def fun(s):
    return EMAIL_REGEX.match(s) is not None

    Pre-compile the pattern and match the regex so that it avoids compilation everytime

  • ricardoandreh
     + 0 comments
    import re

def fun(s):
    return re.match(r"^[\w-]+@[a-zA-Z0-9]+\.[a-zA-Z]{1,3}$", s) is not None

  • magnusinst84
     + 0 comments
    def fun(s):
    try:
        n, m = s.split("@")
        w, e = m.split(".", 1)
    except ValueError:
        return False
    if not n or not w or not e:
        return False
    sp= "_-"
    def cond1(n):
        for i in n:
            if not (i.isupper() or i.islower() or i.isdigit() or i in sp):
                return False
        return True
        
    def cond2(w):
        for i in w:
            if not (i.isupper() or i.islower() or i.isdigit()):
                return False
        return True
        
        
    def cond3(e):
        if len(e) > 3:
            return False
        for i in e:
            if not (i.isupper() or i.islower()):
                return False
        return True
    result = all([cond1(n),cond2(w),cond3(e)])
    return result

  • jpconcerman
     + 0 comments

    using python functionals (No regex)

    extname = s[compsep+1:]

if not (username and compname and extname):
    return False
if not (username == ''.join(list(filter(lambda c: c.isalnum() or c in '_,-', username)))):
    return False
if not (compname == ''.join(list(filter(lambda c: c.isalnum(), compname)))):
    return False
if not (extname == ''.join(list(filter(lambda c: c.isalnum(), extname))) and len(extname) <= 3):
    return False
return True