Remove character from String

Question

I need function or code in order to remove string

 

1st Query:

Example: "Oldest :15 m 14 s"---> I just want to verify Oldest,m and s

Example : Oldest:14t-----> I just want to verify Oldest and t

 

2nd Query:

Example: This is great (14)---> I just want "This is great" it can be This can be great day (17) then i need "This can be great day"

 

Please provide solution ASAP