Is there a comparable function in sas like regexp_extract?

[Tom]

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@Hoibai wrote:

The problem is, the first record is with {"Cdtr":{"Nm":"DEUTSCHE BANK"} .

The second record  is with '{"Cdtr":{"Nm":"VERGOELST GMBH"}'

according to the constant variables {"Cdtr":{"Nm":, each record in the file has a different value.

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I don't understand what you mean be this.  Of course each observation has a different value.  But the PREFIX you are searching for looks exactly the same in both of those example values.  

{"Cdtr":{"Nm":"

Personally I avoid having to use regex if I can get the result I want with simpler functions.

data have;
  infile cards truncover;
  input str $200.;
cards4;
{"Cdtr":{"Nm":"DEUTSCHE BANK"}
{"Cdtr":{"Nm":"VERGOELST GMBH"}
{"ar:pacs.003.002.04":{"Cdtr":{"Nm":"DEUTSCHE BANK"},"CdtrAcct":{"Id":{"IBAN":"DE0111111111111111111100"}}
;;;;

data want;
  length cdtr_nm $60 ;
  set have;
  sp=index(str,'{"Cdtr":{"Nm":');
  if sp then cdtr_nm = dequote(substr(str,sp+length('{"Cdtr":{"Nm":')));
run;

[mkeintz]

Do they all have the form 

   "Cdtr":{"Nm":"XXX XXXX XXXXXX"}

where "XXX XXXX XXXXXX" is the desired result, and can have variable length?

If so, you can always skip the first 14 characters and drop the last 2 characters, which can be done with the SUBSTR and LENGTH functions:

data sample;
  string='"Cdtr":{"Nm":"DEUTSCHE BANK"}';
  new_string=substr(string,15,length(string)-16);

  put (_all_) (= /);
run;

Or if you want something more general, perhaps you can characterize the desired substring as the 5th word, where each double quote is treated as a word separator.  Then, as long as the desired expression is double-quoted, and it is preceded by two expressions that are also double quoted (i.e. preceded by 4 double quotes), you can do this: 

data sample;
  string='"Cdtr":{"Nm":"DEUTSCHE BANK"}';
  new_string=scan(string,5,'"');
  put (_all_) (= /);
run;