Comment by CGamesPlay

I released something similar to this, jsgrep, but the query syntax is actual JS with special variables marking the placeholders. I think the patch syntax makes more intuitive sense in jsgrep; although it is more limited:

  $ cat c.js
  f(x < y, x == z);
  $ grasp bi --replace '{{.r}}+{{.l}}' c.js
  f(y+x, z+x);

In jsgrep, the same substitution could be made by:

  -f(A < B, B == C)
  +f(A + B, B + C)

jsgrep: https://github.com/facebook/jsgrep