Python code to scrape email address using regular expression

Programmers when learn writing web spiders or crawlers, try to write a script to parse/collect email address from website. Here I post a class in Python that can harvest email address. It uses regular expression.

import re

class EmailScraper():
    def __init__(self):        
        self.emails = []

    def reset(self):
        self.emails = []

    def collectAllEmail(self, htmlSource):
        "collects all possible email addresses from a string, but still it can miss some addresses"
        #example: t.s@d.com
        email_pattern = re.compile("[-a-zA-Z0-9._]+@[-a-zA-Z0-9_]+.[a-zA-Z0-9_.]+")
        self.emails = re.findall(email_pattern, htmlSource)
        
    def collectEmail(self, htmlSource):
        "collects all emails that starts with mailto: in the html source string"
        #example: <a href="mailto:t.s@d.com">
        email_pattern = re.compile("<a\s+href=\"mailto:([a-zA-Z0-9._@]*)\">", re.IGNORECASE)
        self.emails = re.findall(email_pattern, htmlSource)

Note that it's not a bullet proof program and don't use it for any bad purpose ;)