Test, validate and match regular expressions
This regular expression isolates the value of the "ipcode" attribute within an XML tag named "<XMLname". Group 1 captures the opening portion of the tag up to the attribute's first quote, and Group 2 captures the closing quote through the end of the tag or line. Using the dot-all modifier ((?s)), it ensures the pattern works correctly even if the XML tag spans multiple lines. It is primarily used for extracting, validating, or replacing specific attribute values in structured markup documents.