[PHP] regex/preg_replace() difficulty

[jonas_weber]

Regular Expressions: How can I indicate that the contents of a term 
(user input*) needs to be treated as 'non-operators/control characters' 
(as *word* to match in that exact way)?
(* Because the term is a user's input I can't escape the control 
characters manually.)

Example:
$result = 
preg_replace('/('.$termWithOptionalBold.')(<\/?span[^>]*>)*()/si', 
'<span class="highlight">\1</span>', $result);

[If $termWithOptionalBold is a "." (period) for example, any char will 
be matched--instead of only the "."]

Any suggestions?

Thanks a lot for your effort!
Best wishes,
jonas
PS: Somewhere I read that '\Q' would do something like that but it 
didn't work.

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