var $haystack = abcdefghijklm var $needle = g var $position = call strstr $haystack=$haystack; $needle=$needle; $before_needle=1 ; print haystack = $haystack
print needle = $needle
print position = $position

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var $position = call strstr $haystack=$haystack; $needle=$needle; $before_needle=0 ; print haystack = $haystack
print needle = $needle
print position = $position