# coding=utf8
# the above tag defines encoding for this document and is for Python 2.x compatibility
import re
regex = r"""
(?P<content>.*?) # Content up to next tag
(?P<markup> # Entire tag
<!\[CDATA\[(?P<cdata>.+?)]]>| # <![CDATA[ ... ]]>
<!--(?P<comment>.+?)-->| # <!-- Comment -->
</\s*(?P<close_tag>\w+)\s*>| # </tag>
<(?P<tag>\w+) # <tag ...
(?P<attributes>
(?P<attribute>\s+
# <snip>: Use this part to get the attributes out of 'attributes' group.
(?P<attribute_name>\w+)
(?:\s*=\s*
(?P<attribute_value>
[\w:/.\-]+| # Unquoted
(?=(?P<_v> # Quoted
(?P<_q>['\"]).*?(?<!\\)(?P=_q)))
(?P=_v)
))?
# </snip>
)*
)\s*
(?P<is_self_closing>/?) # Self-closing indicator
>) # End of tag
"""
test_str = ("In this case, $url will indeed contain http://example.com/whatever.jpg. But what happens when you start getting HTML like this:\n\n"
"<img src='http://example.com/whatever.jpg'>\n"
"or\n\n"
"<img src=http://example.com/whatever.jpg>\n"
"or\n\n"
"<img border=0 src=\"http://example.com/whatever.jpg\">\n"
"or\n\n"
"<img border src=\"http://example.com/whatever.jpg\">\n"
"or\n\n"
"<img\n"
" src=\"http://example.com/whatever.jpg\">\n"
"or you start getting false positives from\n\n"
"<!-- // commented out\n"
"<img src=\"http://example.com/outdated.png\">\n"
"-->\n\n"
"<script><![CDATA[ This is <b>not</b> parsed ]]></script>\n\n"
"<asd ASD=asd>\n\n"
"<!-- // commented out <img src=\"http://example.com/outdated.png\"> -->\n\n"
"No quotes:\n"
"<iframe src=test.html target=xyz></ iframe >\n"
"Self-closing tag:\n"
"<a href=test.html target=xyz/>\n"
"Self closing tag with a space before closure:\n"
"<a href=test.html target=xyz />\n"
"Double quotes:\n"
"<a href=\"test.html\" target=\"xyz\">\n"
"Single quotes:\n"
"<a href='test.html' target='xyz'>\n"
"Escaping double quotes:\n"
"<a href=\"test.html?val=1\" title=\"\\\"No rules exist\\\" Andre Breton's quote\">\n"
"Escaping single quotes (also with spaces between equals signs):\n"
"<a href = \"test.html?val=1\" title = 'Charlie\\'s Angels'>\n"
"Tag without closure (ignored):\n"
"<a href = \"test.html?val=1\" title='Charlie\\'s Angels'\n"
"Tag without opening (ignored):\n"
"a href = \"test.html?val=1\" title=\"Charlie\\\"s Angels\">\n\n")
matches = re.finditer(regex, test_str, re.DOTALL | re.VERBOSE)
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