import re
regex = re.compile(r"(<a\b[^<]*?|(?<!^)\G)([^\/]*?)%20(?=(?![^\/]*\.jpg\">)[^\/\"]*\">)")
test_str = "<a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/34%20-%20kv34%20-%20tomba%20di%20thumtmose%20iii\"> KV34 Tomba di Thutmose III</a>:</b> Nella foto, la pianta della tomba</font></p> </td> </tr> </tbody></table> </div> <div align=\"center\"> <div align=\"center\"> <table border=\"1\" width=\"96%\" id=\"table4\"> <tbody align=\"left\"><tr> <td width=\"11%\" align=\"center\"> <a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/06%20antichi%20egizi%20-%20Tomba%20di%20Amenofi.jpg\"> <img border=\"0\" src=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/06%20antichi%20egizi%20-%20Tomba%20di%20Amenofi%20ante.jpg\" width=\"80\" height=\"64\" alt=\"/06 antichi egizi - Tomba di Amenofi\" /></a></td> <td width=\"87%\" class=\"style4\"> <p class=\"style3\"> <b><a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/35%20KV35%20Tomba%20di%20Amenofi%20II\">KV35 Tomba di Amenofi II</a>; </b> Nella foto, il re davanti alla dea Hathor che gli offra il segno della vita.</p> </td> </tr> <tr> <td width=\"11%\" align=\"center\"> <a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/24%20antichi%20egizi%20-%20tomba%20di%20Horemhab.jpg\"> <img border=\"0\" src=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/24%20antichi%20egizi%20-%20tomba%20di%20Horemhab%20ante.jpg\" width=\"80\" height=\"59\" alt=\"24 antichi egizi - tomba di Horemhab\" /></a></td> <td width=\"87%\" class=\"style4\"> <div class=\"style3\"> <b><a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/57%20kv57%20tomba%20di%20horemhab\"> KV 57Tomba di Horemhab</a><font face=\"Arial\" size=\"2\">: </font></b><font face=\"Arial\" size=\"2\">Nella foto, il faraone è raffigurato di fronte a varie divinità</font></div> </td> </tr> <tr> <td width=\"11%\" align=\"center\"> <a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/09%20antichi%20egizi%20-%20Tomba%20di%20Tutankhamen.jpg\"> <img border=\"0\" src=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/09%20antichi%20egizi%20-%20Tomba%20di%20Tutankhamen%20ante.jpg\" width=\"80\" height=\"92\" alt=\"09 antichi egizi - Tomba di Tutankhamen\" /></a></td> <td width=\"87%\" class=\"style4\"> <b><a href=\"http://example.com/path/to-some-folder/another%20folder/one%20more520folder/uploads/2012/02/some%20folder/another%20folder/62%20kv62%20tomba%20di%20tutankhamen\">KV62 Tomba di Tutankhamen:</a></b> Nella foto, <font face=\"Arial\" size=\"2\">un particolare della decorazione, con la barca solare ed i babbuini che alludono alla prima ora del libro dell'Amduat.</font></td> </tr> <tr> <td"
subst = "\\1\\2-"
result = regex.sub(subst, test_str)
if result:
print(result)
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