Search String Get Value Then move next

[jjmusicpro]

I have a string like this

 

val1=1,val2=2,val3=3,val4=stop,val1=1,val2=2,val3=3,val4=stop,val1=1,val2=2,val3=3,val4=stop,val1=1,val2=2,val3=3,val4=stop,

 

I dont know how to take the string, look for something like "val4=stop" print out everything before that, and move on to the next.

so it should print out something like

 

val1=1,val2=2,val3=3,val4=stop,val1=1

val1=1,val2=2,val3=3,val4=stop,val1=1

val1=1,val2=2,val3=3,val4=stop,val1=1

 

and not have it in one huge string