Re: Regexp not stateless?

[Stefan Monnier]

> (defconst mumamo-script-tag-start-regex
>   (rx "<script"
>       (1+ space)
>       "type"
>       (0+ space)
>       "="
>       (0+ space)
>       ?\"
>       ;;(or "text" "application")
>       ;;"/"
>       ;;(or "javascript" "ecmascript")
>       "text/javascript"
>       ?\"
>       (0+ (not (any ">")))
>       ">"
>       (optional (0+ space) "<![CDATA[" )
>       ))

> This matches at the start of this text with `looking-at':

> <script type="text/javascript">
> <![CDATA[

> However sometimes it matches just to the end of the first line and sometimes
> to the end of the second line (as it should). I am using this little
> function to test:

Some things come to mind:

1 - it's not a bug.  It's just that somehow one of the "space" chars between
    the two tags gets a syntax-table property and is thus not a `space'
    any more.  Try to replace `space' by "[ \n\t]".

2 - it's a bug in regexp.c, but it depends on the position of the gap
    (i.e. the location of the last text insertion/deletion).

3 - could also be a bug in the way the syntax-table property is
    checked/used, but this should only be possible if the buffer has some
    syntax-table text properties nearby.

4 - one of the "spaces" is not a space, but a NBSP or some other
    funny char.

5 - there's some other (invisible) text in there.

6 - ...


        Stefan