[syslog-ng] Forward slashes in QSTRING

Is it possible to use a / as a delimiter in QSTRING? The documentation seems to permit it, but my pattern doesn't work. Here's the pattern: <pattern>Alert Level: @NUMBER:i0:@; Rule: @NUMBER:i1:@ - @ESTRING:s0:;@ Location: @QSTRING:s1:()@ @IPv4:i2:@->syscheck; Integrity checksum changed for: @QSTRING:s4:/'@</pattern> And here's the string I want to match on: Alert Level: 7; Rule: 550 - Integrity checksum changed.; Location: (agentname) 172.16.0.1->syscheck; Integrity checksum changed for: '/etc/fstab' The idea is to extract only 'fstab' (without the quotes). I have also tried 0x2f in place of / with similar results, and various attempts at escaping it have failed. Thanks.