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? about Rule


Hi Everyone,

I am totally puzzled by this and I'm not an Mathematica beginner.  

Let   b = {x == 1, 1 ≤ y ≤ 2, z == 3}   I want to replace  1 ≤ y ≤ 2  by something else, for this question say  12.  So  b/. (a_ ≤ u_ ≤ b_) -> 12 should return  
{x == 1, 12, z == 3}   It doesn't.  Why?  Even this  b/. (1≤ y ≤ 2) -> 12  doesn't work.   I'm at a loss...

Jack


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