Show item on profile page if "x" field is populated

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You can use preg_match for that (if you're using PHP In Template plugin - I can't find preg_match in the phptpl_allowed_funcs.txt file for Template Conditional).
Something like this (in template conditional style, without capturing any part of the matched pattern):

Code:

<if preg_match($pattern,$text) then> The out put here </if>

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