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I have found that this grep command works most of the time except when
there is a space character in the variable $userinput.
What can I do to this expression to make it work when there are spaces
in the $userinput variable?
I am curious why you don't just use the regular expression engine built into php... it would be much more efficient than a call to exec. If you still want to exec, you'll need to quote the regexp.
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