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The old patch warned already the majority of real cases - except the missing white space between attributes.
"The tolerant regex will match both": 
locatestarttagend_tolerant: The main and frequent issue on the web here is the missing white space between attributes (with enclosed values). And there is the new tolerant comma between attributes, which however I have not seen so far anywhere (the old warning machanism and attrfind.match would have already raised it at "junk chars ..." event.
Both issues can be easily warned (also/already) at quite no cost by the slightly extended regex below (when the 2 new non-pseudo regex groups are check against <>None in check_for_whole_start_tag). 
Or missing whitespace could be warned (multiple times) at attrfind time.
attrfind_tolerant : I see no point in the old/"strict" attrfind. (and the difference is guessed 0.000% of real cases). attrfind_tolerant could become the only attrfind.
--
locatestarttagend_tolerant = re.compile(r"""
 <[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
 (?:(?:\s+|(\s*)) # optional whitespace before attribute name
 (?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name
 (?:\s*=\s* # value indicator
 (?:'[^']*' # LITA-enclosed value
 |\"[^\"]*\" # LIT-enclosed value
 |[^'\">\s]+ # bare value
 )
 (?:\s*(,))* # possibly followed by a comma
 )?
 )
 )*
 \s* # trailing whitespace
""", re.VERBOSE)
attrfind_tolerant = re.compile(
 r'\s*([a-zA-Z_][-.:a-zA-Z_0-9]*)(\s*=\s*'
 r'(\'[^\']*\'|"[^"]*"|[^>\s]*))?')
#s='<abc a="b,+"c="d"e=f>text'
#s='<abc a="b,+" c="d"e=f>text'
s='<abc a="b,+",c="d" e=f>text'
m = locatestarttagend_tolerant.search(s)
print m.group()
print m.groups()
#if m.group(1) is not None: self.warning('space missing ...
#if m.group(2) is not None: self.warning('comma between attr...
m = attrfind_tolerant.search(s, 5)
print m.group()
print m.groups()