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2.3.12 Verbatim Patterns
Verbatim patterns.
Here the x_ in the rule matches any expression.
In[1]:= {f[2], f[a], f[x_], f[y_]} /. f[x_] -> x^2
Out[1]= 
The Verbatim tells Mathematica that only the exact expression x_ should be matched.
In[2]:= {f[2], f[a], f[x_], f[y_]} /. f[Verbatim[x_]] -> x^2
Out[2]= 
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