php - iframe Regular Expression form validation -


i'm having trouble validating form entry using regular expression. learning regular expressions , task.

the problem: have attempted write regex match soundcloud iframe. however, form entry accepted whether entry soundcloud iframe or not. appreciated!

this function came with:

function iframe_match ($iframe){ return(preg_match('#/<iframe width="100%" height="450" scrolling="no" frameborder="no"     src="https://w.soundcloud.com/player/\?url=http%3a%2f%2fapi.soundcloud.com%2f|[a-z]|%|[0-9]|    [f]|">\</iframe\>/#', $iframe)) ? true : false; }

and specific form check:

else if (iframe_match($_post['track_file1']) === false){ echo '<br/><br/><font color="red"><strong>must include iframe</strong><font>';   } 

function iframe_match ($iframe){ return(preg_match('/<iframe[^>]*src="https:\/\/w.soundcloud.com\/player\/[^"]+">\s*<\/iframe>/',$iframe)) ? true : false; }

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