The following bug has been logged on the website:
Bug reference: 17761
Logged by: Konstantin Geordzhev
Email address: kosiodg(at)yahoo(dot)com
PostgreSQL version: 11.10
Operating system: tested online
Description:
Executing:
select regexp_matches('a 1x1250x2500',
'(a).*?([1-9]\d*)\s*x\s*([1-9]\d*)(?:\s*x\s*([1-9]\d*))?');
returns: {a,1,1,NULL}
while executing:
select regexp_matches('a 1x1250x2500',
'(a|b).*?([1-9]\d*)\s*x\s*([1-9]\d*)(?:\s*x\s*([1-9]\d*))?');
returns: {a,1,1250,2500}
Shouldn't both results be equal?
Tested online at:
https://extendsclass.com/postgresql-online.html
and on ubuntu version 9.5