> I may be wrong since I haven't profiled this, but my understanding is
> that str_replace is much faster than doing either of the regex
> replacements.  For that reason alone, there is a use for it.

Normally it would be quite faster, however once case sensitivity is added to 
the mix I believe the speed difference would be minimal. I've done some 
benchmarks and the speed difference between str_replace() and preg_replace() 
is only about 1/2 second in across 100000 executions (5 replaces per 
instance). Another .6 of a second is added when preg_replace() is used with 
'i' flag which makes it case insensitive. I have not benchmarked the 
stri_replace code but I imagine it would be in the same ballpark, meaning 
that we are adding a fairly large chunk of code for performance benefit of a 
1 microsecond (1 millionth of a second) per instance.

Ilia

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