Find and Replace using regular expression in dreamviewer

For example: C 206.36 407.64 211.95 407.43 216.27 410.62 

To find  C 206.36 407.64 211.95 407.43

Use given below regular expression
C(\s*\d{3}\.\d{2}){4}\s*

To replace 216.27 410.62  by 216,410


 To be find  the digit use : \.\d{2}\s* 
 To replace by  ,