Can you not do {min,max} in the lookbehind regex? ie, instead of this:
$entity = '(?<!&'
. '[a-zA-Z0-9]{2}' . '|' . '#[0-9]{2}' . '|'
. '[a-zA-Z0-9]{3}' . '|' . '#[0-9]{3}' . '|'
. '[a-zA-Z0-9]{4}' . '|' . '#[0-9]{4}' . '|'
. '[a-zA-Z0-9]{5}' . '|'
. '[a-zA-Z0-9]{6}' . '|'
. '[a-zA-Z0-9]{7}'
. ')';
Do this:
$entity = '(?<!&'
. '[a-zA-Z0-9]{2,7}' . '|' . '#[0-9]{2,4}'
. ')';
Or is that the assertion format restriction you mention in the comment?
-Brad
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