[Mailman-Users] What regular expressions are allowed for Mailman topics?

Dear all,

I'm trying to implement Mailman topics through regular expressions. However I'm not sure, what expression types are supported. I was trying

• ^(OK|WARN|CRIT|UP|DOWN) ->
• ^(OK|WARN|CRIT|UP|DOWN) \-

to catch subject lines like "OK -> CRIT some text" and "UP -> DOWN some text" ecc. The regexpes above don't catch these mail, even though they should be perfectly ok according to several regular expression testers. Interestingly

• ^(OK|WARN|CRIT|UP|DOWN)

/does/ match, but I require the trailing " ->" to discern from other, very similar subjects.

I also didn't find any reference documentation regarding the supported regular expression syntax. Is there any?

Out Mailman version is 2.1.9

Cheers, Frank