title: How to write a JuMP constraint into a text file?
body: <p>I have searched but didn't find an answer. I have read a MPS file into a JuMP model. Now I would like to write a subset of constraints into a text file for further analysis. I know how to write a JuMP model into a LP or MPS file. But here I just want to write a subset of constraints into a text file. If I can parse the constraints, figuring out what are the coefficients and what are the variables, that would even be better.  Thanks in advance!</p>