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    <p>With what is at hand:</p> <pre><code>import re def sibling(bal,text): print 'bal ==' + bal + '\n' # + '\n\n' + s def aux(match): # match.group(4) is '/' or None return ("%s%s&lt;%s'/&gt;%s" % match.group(1,2,3,6) if match.group(4) else "%s%s&lt;%s'&gt;%s'&gt;%s" % match.group(1,2,3,5,6)) return re.sub('(' '(^\s*)&lt;(' + bal + ')(?: [^/&gt;]+)?' # 2 and 3 '(?:(/)|&gt;(?:.*?)((?:(?:\n|\r\n?)\\2)?&lt;/\\3))' # 4 and 5 '&gt;(\n|\r\n?|\Z)' # 6 ')', aux, text, flags = re.MULTILINE|re.DOTALL) ch = """\ &lt;a&gt; &lt;b&gt; &lt;/b&gt; &lt;/a&gt; """ dh = """\ &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; """ print sibling('a',ch) print '------------------------------------------------------' print sibling('b',ch) print '------------------------------------------------------' for x in ('entry','dd:country_code','content','OTF','FECS', 'BackEndCompatibility','BackEnd','Forth'): print sibling(x,dh) print '------------------------------------------------------' </code></pre> <p>Result:</p> <pre><code>bal ==a &lt;a&gt; &lt;b&gt; &lt;/b&gt; &lt;/a&gt; &lt;a'&gt; &lt;/a'&gt; ------------------------------------------------------ bal ==b &lt;a&gt; &lt;b&gt; &lt;/b&gt; &lt;b'&gt; &lt;/b'&gt; &lt;/a&gt; ------------------------------------------------------ bal ==entry &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; &lt;entry'&gt; &lt;/entry'&gt; ------------------------------------------------------ bal ==dd:country_code &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;dd:country_code'&gt;&lt;/dd:country_code'&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; ------------------------------------------------------ bal ==content &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;content'&gt;&lt;/content'&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; ------------------------------------------------------ bal ==OTF &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;OTF'&gt; &lt;/OTF'&gt; &lt;/entry&gt; ------------------------------------------------------ bal ==FECS &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;FECS'&gt; &lt;/FECS'&gt; &lt;/OTF&gt; &lt;/entry&gt; ------------------------------------------------------ bal ==BackEndCompatibility &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;BackEndCompatibility'&gt; &lt;/BackEndCompatibility'&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; ------------------------------------------------------ bal ==BackEnd &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;BackEnd'/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; ------------------------------------------------------ bal ==Forth &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;feed xmlns="http://www.w3.org/2005/Atom" xmlns:dd="http://example.com/ns/1.0" xml:lang="en-US"&gt; &lt;entry&gt; &lt;dd:country_code&gt;USA&lt;/dd:country_code&gt; &lt;content type="html"&gt;Hello World!&lt;/content&gt; &lt;OTF&gt; &lt;FECS state="disabled" version="2.2.0.0"&gt; &lt;BackEndCompatibility major="2.2" state="disabled"&gt; &lt;BackEnd state="disabled" version="2.2.0.0"/&gt; &lt;Forth type="ziwi"&gt;d,;%er*dkj@jkber-uyr&lt;/Forth&gt; &lt;Forth'&gt;&lt;/Forth'&gt; &lt;/BackEndCompatibility&gt; &lt;/FECS&gt; &lt;/OTF&gt; &lt;/entry&gt; ------------------------------------------------------ </code></pre> <p>It works for <code>'a'</code> and</p> <pre><code>"""\ &lt;a&gt; &lt;b&gt; &lt;/b&gt; &lt;/a&gt; """ </code></pre> <p>but not</p> <pre><code>"""\ &lt;a&gt; &lt;b&gt; &lt;/b&gt; &lt;/a&gt;""" </code></pre>
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