From: Robert Klemme <bob.news@...>
Date: 2005-02-25T02:00:02+09:00
Subject: Re: regexp help sought


<rpardee@comcast.net> schrieb im Newsbeitrag
news:1109263535.280360.203760@g14g2000cwa.googlegroups.com...
> Hey All,
>
> I'm trying to parse lines from my text editor's config file, which look
> like this (pls watch for line wrap--there is one line per language,
> starting with /L<<digit>>):
>
> /L1"SAS" Line Comment = * Block Comment On = /* Block Comment Off = */
> Block Comment On Alt = * Block Comment Off Alt = ; Nocase File
> Extensions = SAS
> /L2"Visual Basic" Line Comment = ' File Extensions = BAS FRM CLS VBS
> CTL WSF
> /L4"HTML" Nocase Noquote HTML_LANG Block Comment On = <!-- Block
> Comment Off = --> Block Comment On Alt = <% Block Comment Off Alt = %>
> String Chars = "' File Extensions = HTM HTML ASP SHTML HTT HTX JSP
> /L11"Ruby" Line Comment Num = 2# Block Comment On = =begin Block
> Comment Off = =end String Chars='" Escape Char = \ File Extensions = RB
> RBW
>
> I'm trying to write a method for extracting the comment markers & their
> types (line/block & on/off).  Regexps seemed the obvious tool, and I
> eventually came up with this one:
>
>    c = Regexp.new("(Line|Block) Comment (On |Off |On Alt |Off Alt)*=
> ([^\s\t\r\n\f]+) ")
>
> This is working well so far, except that it only grabs out the first
> type of comment in each line.  I'd hoped that I could make it get all
> the comment types by putting an additional set of parens and a +
> quantifier around the whole expression:
>
>    c = Regexp.new("((Line|Block) Comment (On |Off |On Alt |Off Alt)*=
> ([^\s\t\r\n\f]+))+ ")
>
> But that just seems to break it--that version doesn't capture anything.
>
> Anybody got a clue for me?  I'm using v1.8 on windows.  My code is
> below.  (And again, pls watch for line wrapping).

You want String#scan

matches = line.scan(re)

or

line.scan(re) do |match|
....
end

Kind regards

    robert