replace methods

[DANA-Laboratory]

Hi
Most of mathematical languages have various replace methods and rules to work with expressions, e.g. see ref[1] & ref[2].
What do you think? Is it useful to add some here?
Please see my works in ref[3] and if it is possible i like to push them here.
thanks

references:
1- http://reference.wolfram.com/language/tutorial/ApplyingTransformationRules.html
2- http://reference.wolfram.com/language/ref/Replace.html
3- https://github.com/DANA-Laboratory/ThermophysicalCalculation.jl/blob/master/src/Replace.jl

[mlubin]

I've built my own functionality like this a couple of times. It would be useful to have a generic way to do this. Not quite sure it belongs in this package though.