# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"(?:youtube\.com\/\S*(?:(?:\/e(?:mbed))?\/|watch\?(?:\S*?&?v\=))|youtu\.be\/)([a-zA-Z0-9_-]{6,11})"
test_str = ("Regular expressions can be a pain. This tool is designed to help developers learn, practice, and compose regular expressions.\n\n"
"## tests:\n\n"
"// should not match\n"
"youtube.com/embed/v=0EWbonj7f18\n"
"youtube.com/e/v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/embed/v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/e/v=0EWbonj7f18\n"
"hey guys go to youtube and v=thisweird video i found\n"
"i found a youtube video on 4chan /v/foobarbaz\n"
"but we work at youtu.be and /thisweird video\n\n"
"// short links\n"
"youtu.be/WijF8aivOo8\n"
"youtu.be/0EWbonj7f18\n\n"
"// mixed\n"
"youtube.com/user/sandervandoorntv/watch?v=WijF8aivOo8\n"
"youtube.com/user/sandervandoorntv/watch?v=WijF8aivOo8&feature=related\n"
"youtube.com/user/sandervandoorntv/watch?feature=related&v=WijF8aivOo8\n"
"youtube.com/watch?v=0EWbonj7f18\n"
"youtube.com/watch?feature=related&v=0EWbonj7f18\n"
"youtube.com/watch?v=0EWbonj7f18&feature=related\n"
"youtube.com/embed/watch?v=0EWbonj7f18\n"
"youtube.com/embed/watch?feature=related&v=0EWbonj7f18\n"
"youtube.com/embed/v/0EWbonj7f18\n"
"youtube.com/e/v/0EWbonj7f18\n"
"youtube.com/e/watch?v=0EWbonj7f18\n"
"youtube.com/e/watch?feature=related&v=0EWbonj7f18\n\n"
"// attribution link\n"
"youtube.com/attribution_link?u=/user/sandervandoorntv/watch?v=WijF8aivOo8\n"
"youtube.com/attribution_link?u=/user/sandervandoorntv/watch?v=WijF8aivOo8&feature=related\n"
"youtube.com/attribution_link?u=/user/sandervandoorntv/watch?feature=related&v=WijF8aivOo8\n"
"youtube.com/attribution_link?u=/watch?v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/watch?feature=related&v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/watch?v=0EWbonj7f18&feature=related\n"
"youtube.com/attribution_link?u=/embed/watch?v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/embed/watch?feature=related&v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/embed/v/0EWbonj7f18\n"
"youtube.com/attribution_link?u=/e/v/0EWbonj7f18\n"
"youtube.com/attribution_link?u=/e/watch?v=0EWbonj7f18\n"
"youtube.com/attribution_link?u=/e/watch?feature=related&v=0EWbonj7f18\n\n"
"The HiFi RegExp tool is 100% JavaScript using jQuery. This tool was created by New Media Campaigns, the team behind HiFi, a next-generation CMS for web designers, developers, and agencies. Enjoy!\n")
matches = re.finditer(regex, test_str)
for matchNum, match in enumerate(matches, start=1):
print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group()))
for groupNum in range(0, len(match.groups())):
groupNum = groupNum + 1
print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum)))
# Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html