[Bro-Dev] [JIRA] (BIT-1042) Caret in regex pattern doesn't match start of line

[Brian Little (JIRA)]

    [ https://bro-tracker.atlassian.net/browse/BIT-1042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13315#comment-13315 ] 

Brian Little commented on BIT-1042:
-----------------------------------

I was using that as an simple example, but it shouldn't match at all.

The specific problem I have it trying to remove the first . in a domain, using

print sub(".github.com", /^\./, "");
#github.com

This works, however that specific pattern /^\./ also matches this:

print sub("github.com", /^\./, "");
#githubcom (note missing .)

Is "sub" the wrong tool to use for this? It seems to work for other patterns fine, including the $ (end of string), but not for the start of string
                
> Caret in regex pattern doesn't match start of line
> --------------------------------------------------
>
>                 Key: BIT-1042
>                 URL: https://bro-tracker.atlassian.net/browse/BIT-1042
>             Project: Bro Issue Tracker
>          Issue Type: Bug
>          Components: Bro
>    Affects Versions: 2.1
>         Environment: Ubuntu 12.04 and 13.04. Dependencies from apt-get ubuntu repos only.
>            Reporter: Brian Little
>            Priority: Normal
>              Labels: pattern, regex
>         Attachments: caret.bro
>
>
> print split_all("some string", /^t/);
> I would expect it to not match ^t, but it matches any t in the string.
> output:
> {
> [1] = some s,
> [3] = ring,
> [2] = t
> }
> expected:
> {
> [1] = some string
> }
> tested on bro 2.1 and github master 2.1-824

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