so-rule-update fails - "unterminated subpattern", re.error: missing"

[droba666]

Hi all,

i have an on prem distributed installation (ISO setup), version 2.3.270 with internet connection through web proxy.
I've noticed that when i run ids rule update script it fails returning the following error message:
"2024-01-04 12:33:58,950 - -- Loading ./rulecat.conf.
2024-01-04 12:33:58,952 - -- Forcing Suricata version to 6.0.
Traceback (most recent call last):
File "/usr/local/bin/idstools-rulecat", line 12, in
sys.exit(main())
File "/usr/local/lib/python3.9/site-packages/idstools/scripts/rulecat.py", line 841, in main
modify_filters += load_filters(args.modify)
File "/usr/local/lib/python3.9/site-packages/idstools/scripts/rulecat.py", line 375, in load_filters
filter = ModifyRuleFilter.parse(line)
File "/usr/local/lib/python3.9/site-packages/idstools/scripts/rulecat.py", line 222, in parse
pattern = re.compile(a)
File "/usr/local/lib/python3.9/re.py", line 252, in compile
return _compile(pattern, flags)
File "/usr/local/lib/python3.9/re.py", line 304, in _compile
p = sre_compile.compile(pattern, flags)
File "/usr/local/lib/python3.9/sre_compile.py", line 764, in compile
p = sre_parse.parse(p, flags)
File "/usr/local/lib/python3.9/sre_parse.py", line 948, in parse
p = _parse_sub(source, state, flags & SRE_FLAG_VERBOSE, 0)
File "/usr/local/lib/python3.9/sre_parse.py", line 443, in _parse_sub
itemsappend(_parse(source, state, verbose, nested + 1,
File "/usr/local/lib/python3.9/sre_parse.py", line 836, in _parse
raise source.error("missing ), unterminated subpattern",
re.error: missing ), unterminated subpattern at position 4"

Any ideas what can cause such issue?

[droba666]

it appeared to be connected to syntax issue in modify.conf file.
case closed.