c:\test>junk9
'Error 123 on SystemA file not found error' does     match (?-xism:Error 123 on (\S+) file not found error)
'Error 123 on SystemA file not found error' does not match (?-xism:Error 124 on (\S+):(\S+) no space left)
'Error 123 on SystemB file not found error' does     match (?-xism:Error 123 on (\S+) file not found error)
'Error 123 on SystemB file not found error' does not match (?-xism:Error 124 on (\S+):(\S+) no space left)
'Error 123 on SystemC file not found error' does     match (?-xism:Error 123 on (\S+) file not found error)
'Error 123 on SystemC file not found error' does not match (?-xism:Error 124 on (\S+):(\S+) no space left)
'Error 124 on User1:FileA no space left' does not match (?-xism:Error 123 on (\S+) file not found error)
'Error 124 on User1:FileA no space left' does     match (?-xism:Error 124 on (\S+):(\S+) no space left)
'Error 124 on User2:FileB no space left' does not match (?-xism:Error 123 on (\S+) file not found error)
'Error 124 on User2:FileB no space left' does     match (?-xism:Error 124 on (\S+):(\S+) no space left)
'Error 124 on User3:FileC no space left' does not match (?-xism:Error 123 on (\S+) file not found error)
'Error 124 on User3:FileC no space left' does     match (?-xism:Error 124 on (\S+):(\S+) no space left)