This is documentation for Mathematica 3, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)
 Documentation / Mathematica / The Mathematica Book / Principles of Mathematica / Patterns  /

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


  • 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