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I've certainly never tested it with conditionals.

I think it's the conditional indeed, because it works smoothly when I re-write it to not use a conditional:

% ^ \s* ( # <1> # Single tags like <foo/> < \s* [a-zA-Z:]+ (?: \s*[a-zA-Z:]* \s* = \s* (?:'[^']*'|"[^"]*") )* \s* /\s* > | # Tags in pairs like <foo>content</foo> < \s* ([a-zA-Z:]+) # <2/> (?: \s*[a-zA-Z:]* \s* = \s* (?:'[^']*'|"[^"]*") )* \s* > (?:[^<>]* | (?1))* <\s*/\s*\2\s*> ) # </1> \s* $ %x
<foo><bar></bar></foo> # Match <foo><bar></foo></bar> # No match <foo><bar/></foo> # Match <foo><bar></foo> # No match <foo bar=baz/> # No match <foo bar="baz"> # No match <foo bar="baz"/> # Match < fooo / > # Match <foo/>foo # No match foo<foo/> # No match <foo>foo</foo> # Match <foo><bar/>foo</foo> # Match #<a><b><c></c></b></a> # No match (WRONG!!)
Now, there's still the three-level-deep problem...

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In reply to Re: Re: Re: More Power to your Regex by Juerd
in thread More Power to your Regex by robin

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