find missing tags with preg match all

[phparion]

hi

i have strings which is valid when

{i}missing #1 tag {p}"p"{c}{product_price}{/c}{p}2000{/p}{/i}{/p}

but INVALID when

{i}missing #1 tag {p}"p"{c}{product_price}{/c}{p}2000{/p}{/i}

as p tag is missing for the first opening of opening p-tag. this can be true in opposite case when an OPENING p-tag is missing and closing tag is found.

how can i strip out such broken tags?

I cannot use something like

preg_match_all("/\{p\}(.*?)\{\/?p\}",$str,$matches);

[coopster]

Maybe something like the tidy extension would come in handy here?