simplify a regex to reduce recursion -


i have regex this:

/^from: ((?!\n\n).)*\nsubject:.+/msu

with point of matching block looks this:

from: john smith cc: jane smith subject: cat videos

(ie- they're in contiguous block) not if there blank line breaking block, this:

from: john smith  subject: cat videos

but i've been finding php script uses segfaulting. able mitigate segfaults setting pcre.recursion_limit lower number (i used 8000), occurs me i'm trying should doable without great deal of recursion. using horribly inefficient method of catching \n\n ?

i use "not newline":

/^from:[^\n]*\nsubject:.+/msu

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