RegExClean error

RegExClean error

I have a street Name column and in the column the records are like this
**Street_Names**
243 abcd Ex. Strt
342 xcvd Ex. Strt
I need the out put in 3 columns as below
**Column1 column2 column3**
243 abcd Extension Street
342 xcvd Extension Street
I tried using RegexClean Component
match expression: for\s(?<N_Street_Name_N>-?\d\d?)\sN_Street_Names
Replace Expression: ${N_Street_Name_N}
This is just a beginning but I am having a value returned as
NULL