Conditional strings joining?

Questions
1

I have a following question : I’ve got the list :

{"{0, 90012}", "{0, 90013}", "{0, 90016}", "{0, 90022}", "{0, 90034}", 
 "{0, 90042}", "{0, 70102}", "{0, 90106}", "{0, 90115}", "{0, 90131}", 
 "{0, 90132}", "{0, 90137}", "{0, 90153}", "{0, 90214}", "{0, 90222}", 
 "{0, 90226}", "{0, 50230}", "{0, 20234}", "{0, 90239}", "{0, 90247}", 
 "{0, 90304}", "{0, 90306}", "{0, 90312}", "{0, 90316}", "{0, 90323}", 
 "{0, 90325}", "{0, 90328}", "{0, 90331}", "{0, 90332}", "{0, 90333}", 
 "{0, 90336}", "{0, 90344}", "{0, 90349}", "{0, 90351}", "{0, 90354}", 
 "{0, 90358}", "{0, 90408}", "{0, 90413}", "{0, 90416}", "{0, 90417}"}

I’d like to join only these strings which have 9 right after comma ----f.e.---“{090012}”,“{090013}”… and to take strings of numbers which start after
comma for the others ------f.e.----“{70102}”,“{20234}” Can conditional flow functions be applied for this ?

2

One possible way is

StringReplace[list, {"0, 9" -> "09", "0, " -> ""}]

(* Out[3]= {"{090012}", "{090013}", "{090016}", "{090022}", "{090034}", "{090042}", 
 "{70102}", "{090106}", "{090115}", "{090131}", "{090132}", "{090137}", 
 "{090153}", "{090214}", "{090222}", "{090226}", "{50230}", "{20234}", 
 "{090239}", "{090247}", "{090304}", "{090306}", "{090312}", "{090316}", 
 "{090323}", "{090325}", "{090328}", "{090331}", "{090332}", "{090333}", 
 "{090336}", "{090344}", "{090349}", "{090351}", "{090354}", "{090358}", 
 "{090408}", "{090413}", "{090416}", "{090417}"} *)

The following tutorial may be of interest:

Working with String Patterns

3

Thank You for reply