Please solve the programming task below using a self-contained code snippet in a markdown code block.

An n x n grid is composed of 1 x 1 squares where each 1 x 1 square consists of a '/', '\', or blank space ' '. These characters divide the square into contiguous regions.
Given the grid grid represented as a string array, return the number of regions.
Note that backslash characters are escaped, so a '\' is represented as '\\'.
 
Please complete the following python code precisely:
```python
class Solution:
    def regionsBySlashes(self, grid: List[str]) -> int:
```