Question

I have some strings in python, like:

1) 'a_1_2+c_2_4 + 5'
2) 'ctl_1_3/80'
3) 'd_10_55'
...

I want to replace them with re. They should look like:

1) 'p.get("a_1_2", 0)+p.get("c_2_4", 0) + 5'
2) 'p.get("ctl_1_3", 0)/80'
3) 'p.get("d_10_55", 0)'

Can you help me with regular expression?

P.S. p is simple dict in python

Answer 1

In [7]: s = 'a_1_2+c_2_4 + 5'

In [8]: re.sub(r'(\w+_\d+_\d+)', r'p.get("\1", 0)', s)
Out[8]: 'p.get("a_1_2", 0)+p.get("c_2_4", 0) + 5'

It’s unclear what rules govern the second argument to p.get(). It is present in the first example but not the other two.