regex - Regular Expression for irregularly occurring repeating string -

i searched have not found answer question - maybe obvious no 1 else had ask...

i using ultraedit 16.00 run regular expressions in perl mode...

situation:

i have delimited string can contain variable number of repeating segments must adhere specific format. these segments occur randomly throughout delimited string.

example:

clp*data*data*data~ref*data*data~n1*data*data*data~**cas*oa*29*99.99**~amt*i*99.99~svc*data*data*data*data~**cas*pr*99.99**~**cas*co**99.99**~dtm*150*date~amt*b6*99.99~svc*data*data*data*data~cas*pr*n16*99.99~**cas*co* *99.99**...line continues here.

correct format - cas*oa*29*99.99~
incorrect format 1 - cas*oa* *99.99~
incorrect format 2 - cas*oa**99.99~

goal:

identify strings of cas segments adhere format.

things i've tried:

(btw: know regular expressions not optimized, please give me break)

cas segment missing value or containing 1 or more spaces

cas\*(oa|pr|cr|co)\*\*[-]?[\d]+\.?[\d]{0,2}~ matches first instance if finds
cas\*(oa|pr|cr|co)\*[\s]+?\*[-]?[\d]+\.?[\d]{0,2}~ matches first instance if finds

cas segment not missing value or containing space(s)

cas\*(oa|pr|cr|co)\*[^0-9a-z]+?\*[-]?[\d]+\.?[\d]{0,2}~ again, matches first instance

negative lookahead using combinations of above (i new trying approach)

^(?:(?!ab).)+$ - ab => one of above regular expressions - never got work

question:

how write regular expression enforce/validate format of every cas instance no matter how occurs (there potential 0 instances)?

to every cas instance in string valid there not exist @ least 1 invalid cas sequence. approach getting @ negative lookahead simplest way represent - here's example:

/^(?!.*cas(?!<whatever matches valid cas instance>))/ 

basically: "make sure there not exist in string instance of cas not followed whatever matches valid cas instance". replace contents of second negative lookahead, , include whatever before 'cas' indicates start of cas instance.

as can see, don't need match string start finish want.