Question

How to replace the strings (4000 to 4200 ) to (5000 to 5200) in vim ..

Answer 1

Another possibility:

:%s/\v<4([01]\d{2}|200)>/5\1/g

This one does 200 as well, and it does not suffer from the “leaning toothpick syndrome” too much since it uses the \v switch.

EDIT #1: Added word boundary anchors ('<' and '>') to prevent replacing "14100" etc.

---

EDIT #2: There are cases where a “word boundary” is not enough to correctly capture the wanted pattern. If you want white space to be the delimiting factor, the expression gets somewhat more complex.

:%s/\v(^|\s)@<=4([01]\d{2}|200)(\s|$)@=/5\1/g

where “(^|\s)@<=” is the look-behind assertion for “start-of-line” or “\s” and “(\s|$)@=” is the look-ahead for “end-of-line” or “\s“.