Matching two words with some characters in between in regular expression

Question

I want to do a match for a string when no abc is followed by some characters (possibly none) and ends with .com.

I tried with the following

Answer 1

This looks like an XY Problem.

DVK's answer shows you how you can tackle this problem using regular expressions, like you asked for.

My solution (in Python) demonstrates that regular expressions are not necessarily the best approach and that tackling the problem using your programming language's string-handling functionality may produce a more efficient and more maintainable solution.

#!/usr/bin/env python

import unittest

def is_valid_domain(domain):
    return domain.endswith('.com') and 'abc' not in domain

class TestIsValidDomain(unittest.TestCase):

    def test_edu_invalid(self):
        self.assertFalse(is_valid_domain('def.edu'))

    def test_abc_invalid(self):
        self.assertFalse(is_valid_domain('abc.com'))
        self.assertFalse(is_valid_domain('abce.com'))
        self.assertFalse(is_valid_domain('abcAnYTHing.com'))

    def test_dotcom_valid(self):
        self.assertTrue(is_valid_domain('a.com'))
        self.assertTrue(is_valid_domain('b.com'))
        self.assertTrue(is_valid_domain('ab.com'))
        self.assertTrue(is_valid_domain('ae.com'))

if __name__ == '__main__':
    unittest.main()

See it run!

Update

Even in a language like Perl, where regular expressions are idiomatic, there's no reason to squash all of your logic into a single regex. A function like this would be far easier to maintain:

sub is_domain_valid {
    my $domain = shift;
    return $domain =~ /\.com$/ && $domain !~ /abc/;
}

(I'm not a Perl programmer, but this runs and gives the results that you desire)