SAS PRXPARSE usage to retrieve length of string matching pattern - regex

Question

I have to retrieve the X-Axis and Y-Axis pos from ADDITIONAL_DETAILS field which is more than 300 bytes in length.
Somewhere in this string, I am getting the location details as RETLOCID=2312.4892 like that.
I am trying to use PERL REGEX in SAS.
Problem: I am able to get the starting position into postn1 from call prxsubstr(MATCH_PATTERN1, ADDITIONAL_DETAILS, postn1,length1); but the length is always returned as 8 even though it is more than that.
TRANSACTION_ID = substrn(ADDITIONAL_DETAILS, postn1, length1); This is not giving me proper value when I am restricting length to 8. Any help is appreciated. Below is the code:
DATA WORK.LOCATION;
INFILE DATALINES;
INPUT ADDITIONAL_DETAILS $50.;
datalines;
afdsf RFTXNID=121.5435 xx
fdsg RFTXNID=7821.5487 xx fdsg
gfdgf
;
RUN;
data WORK.POSITION;
set WORK.POSITION;
if _N_ = 1 then do;
MATCH_PATTERN1 = PRXPARSE("/(RETLOCID=)/");
MATCH_PATTERN2 = PRXPARSE("/([0-9]{1,}\.[0-9]{1,})/");
end;
retain MATCH_PATTERN1 MATCH_PATTERN2;
call prxsubstr(MATCH_PATTERN1, ADDITIONAL_DETAILS, postn1,length1);
call prxsubstr(MATCH_PATTERN2, ADDITIONAL_DETAILS, postn2,length2);
if postn1 > 0 and not missing(ADDITIONAL_DETAILS) then
TRANSACTION_ID = substrn(ADDITIONAL_DETAILS, postn1 + 8, length1);
RUN;
data work.POSITION;
set work.POSITION;
drop MATCH_PATTERN1 postn1 length1;
run;
I need to pull 121.5435 and 7821.5487

Answer 1

Try this:
DATA WORK.LOCATION;
INPUT ADDITIONAL_DETAILS $50.;
string=prxchange('s/[a-z=_]+//i',-1,ADDITIONAL_DETAILS);
datalines;
afdsf RFTXNID=121.5435 xx
fdsg RFTXNID=7821.5487 xx fdsg
DISTR_QUOTE=66.92
gfdgf
;
run;
Or
DATA WORK.LOCATION;
INPUT ADDITIONAL_DETAILS $50.;
length string $20.;
if prxmatch('/\=/',ADDITIONAL_DETAILS)=0 then string='';
else string=prxchange('s/.*(?<=\=)([^a-z]+).*/$1/i',-1,ADDITIONAL_DETAILS);
datalines;
afdsf RFTXNID=121.5435 xx
fdsg RFTXNID=7821.5487 xx fdsg
gfdgf
DISTR_QUOTE=66.92
;
proc print;
run;