The function here is going to apply pattern matching using regex on the selected
dataframe and returns the dataframe without any null values based on the given predetermined
conditions
1)Manual Regular Expression
2)Regular Expression from start
3)Regular Expression from end
4)Regular Expression from between
The function here is going to apply pattern matching using regex on the selected dataframe and returns the dataframe without any null values based on the given predetermined conditions 1)Manual Regular Expression 2)Regular Expression from start 3)Regular Expression from end 4)Regular Expression from between