topic Re: FIND an expression in a character variable in SAS Programming

FIND an expression in a character variable

Noomen — Mon, 27 Apr 2020 19:37:45 GMT

Hi all,

I want to extract (from a variable called textvar) the following expression : the two letters UN followed by 4 numbers. This means from 'UN0001' to "UN9999".

I need help with the prx because I found examples are about numbers or letters but not both !

data want ; set have ;
num = prxchange(' ', textvar);
newvar=num;
run;

Thanks for your help.

Re: FIND an expression in a character variable

mkeintz — Mon, 27 Apr 2020 19:47:24 GMT

Is it anywhere in the text, or is it always in a particular location in the text?

Re: FIND an expression in a character variable

novinosrin — Mon, 27 Apr 2020 20:00:18 GMT


data have;
text='UN0001';
output;
text="UN9999";
output;
run;
/*With UN as prefix, so hardcoded the letters UN followed by digits*/
data want;
set have;
num=prxchange('s/UN(\d{4})/$1/', -1, text);
run;
/*or*/
/*any 2 letters as prefix followed by numbers*/
data want;
set have;
num=prxchange('s/[a-z]{2}(\d{4})/$1/i', -1, text);
run;

text	num
UN0001	0001
UN9999	9999

Re: FIND an expression in a character variable

Noomen — Mon, 27 Apr 2020 21:02:09 GMT

It could be anywhere.

Re: FIND an expression in a character variable

Noomen — Wed, 29 Apr 2020 16:11:55 GMT

Hello, I apologize, I was busy so I couldn't give you feedback sooner.

Your solution is close but It is not exactly what I am looking for.

The product ID written as UNXXXX has to be copied form the variable texto to product, as shown below.

Variable texto stays the same.

Thank you all.

DATA have;
texto="DURING UNLOADING, IT WAS FOUND THAT A TRUCK with UN3098 (HYDROGEN PEROXIDESPILLED)"; output;
texto="While in transit, product UN1258 spilled"; output; run;

DATA want ;
texto="DURING UNLOADING, IT WAS FOUND THAT A TRUCK with UN3098 (HYDROGEN PEROXIDE)"; product="UN3098"; output;
texto="While in transit, product UN1258 spilled"; product="UN1258";output; run;

Re: FIND an expression in a character variable

novinosrin — Wed, 29 Apr 2020 16:30:21 GMT

Hi @Noomen No worries at all. Assuming you have posted a representative sample for us, the solution seems rather simple as the following. Please see if this helps.

DATA have;
texto="DURING UNLOADING, IT WAS FOUND THAT A TRUCK with UN3098 (HYDROGEN PEROXIDESPILLED)"; output;
texto="While in transit, product UN1258 spilled"; output; run;

data want;
 set have;
 product=prxchange('s/(.*)(UN\d{4})(.*)/$2/i', -1, texto);
run;

proc print noobs;run;

texto	product
DURING UNLOADING, IT WAS FOUND THAT A TRUCK with UN3098 (HYDROGEN PEROXIDESPILLED)	UN3098
While in transit, product UN1258 spilled	UN1258