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Re^2: Matching terminals with Parse::RecDescent

by fce2 (Sexton)
on Dec 12, 2006 at 04:01 UTC ( [id://589212]=note: print w/replies, xml ) Need Help??


in reply to Re: Matching terminals with Parse::RecDescent
in thread Matching terminals with Parse::RecDescent

/foo$/ works for the example script. "foo" /\Z/ didn't match anything (though /foo\Z/ did). All fall down if I test with this grammar: 
line: FOO BAR
FOO: /foo\Z/
BAR: /bar\Z/

[download]
(and use $p->line instead of $p->foo). I probably should have been more specific, but I'm looking for a more generalised solution to this, or at least some understanding of where my expectations are wrong.

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Re^3: Matching terminals with Parse::RecDescent
by ikegami (Patriarch) on Dec 12, 2006 at 06:36 UTC

    or at least some understanding of where my expectations are wrong.

    Your grammar expects to match

    1. 0 or more whitespace characters (see <skip>),
    2. followed by "foo",
    3. followed by the end of the string to parse,
    4. 0 or more whitespace characters,
    5. followed by "bar",
    6. followed by the end of the string to parse.
[reply]
[d/l]
Re^3: Matching terminals with Parse::RecDescent
by GrandFather (Saint) on Dec 12, 2006 at 06:25 UTC

    With the grammar:

        line: FOO BAR /$/
    FOO: "foo"
    BAR: "bar"

    [download]

    and the invocation changed line to:

        if (defined (my $ret = $p->line($test))) {

    [download]

    I get:

    no match: 'foo'
no match: 'foo '
match: 'foo bar' -> ''
no match: 'football'
no match: 'fog'
no match: 'barfoo'
no match: 'bar foo'

    [download]

    Is that not what you expect?

    DWIM is Perl's answer to Gödel
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