php - Regular Expressions - Match inside a Match -

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i trying find way match inside match. still reading oreilly's book on regular expressions, have now:

i need values inputs inside form. page contains multiple forms, similar this:

type="checkbox" value="([^"])"

but need target checkbox values inside specific form. using preg_match way.

p.s. know form preg_match first, , match inside result, i'm wondering how in regex.

preg_match("|type=\"checkbox\" value=\"(.*?)\"|");

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