php - Match pattern and exclude substrings with preg_match_all -

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i need find strings placed between start , end, escluding padding substring matched string. best way i've found is

$r="stuffstartthispaddingisendstuffstuffstartwhatpaddingiwantpaddingtopaddingfindendstuff" ; preg_match_all('/start(.*?)end/',str_replace('padding','',$r),$m); print(join($m[1])); > thisiswhatiwanttofind

i want smallest code size possible: there shorter preg_match_all , no str_replace, returns directly string without join arrays? i've tried lookaround expressions can't find proper one.

$r="stuffstartthispaddingisendstuffstuffstartwhatpaddingiwantpaddingtopaddingfindendstuff"; echo preg_replace('/(end.*?start|padding|^[^s]*start|end.*$)/', '', $r);

this should return thisiswhatiwanttofind using single regular expression pattern

explanation:-

end.*?start  # replace occurrences of end start padding      # replace padding ^[^s]*start  # replace character until first start (inclusive) end.*$       # replace last end , until end of string

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