# Special case just for Textpatterns one line tags.
$text = preg_replace_callback('{
	(?:
		(?<=\n\n)		# Startingafter a blank line
		|			# or
		\A\n?			# thebeginning of the doc
		)
		(			# save in $1
			[ ]{0,'.$less_than_tab.'}			
			<(txp)(.*)	# start tag = $2
			\b		# word break
			([^<>])*?	# 
			/?>		# the matching end tag
			[ \t]*
			(?=\n{2,}|\Z)	# followed by a blank line or end of document
		)
	}x',
	'_HashHTMLBlocks_callback',
	$text);