Re^3: Regex solution needed

Thanks for all the input, guys. I enhanced the initial suggestion to include a few more lookforward possibilities which I think covers enough bases for me to keep it in the dictionary. I omitted the dirty test cases since these are "sacred" boards, but they did get caught correctly :)

my @tests = (
"How bout them cocks?",
"I'm a big cocks fan",
"I love the cocks",
"That cocks game was sweet",
"Anyone know the cocks score from last night?",
"gamecocks rule",
"I love the gamecocks, but...",
"My favorite cocks player is..."
);

foreach my $s (@tests)
{
    if ($s =~ /
    (?<! \b a )
    (?<! \b the )
    (?<! \b them )
    (?<! \b game )
    (?<! \s )
    \s* cocks? \b
    (?! \s fan )
    (?! \s game )
    (?! \s score )
    (?! \s player )
    /x)
    {
        print "Vulgar: '$s'\n";
    }
}
[download]

-Darin

Comment on Re^3: Regex solution needed Download Code

Replies are listed 'Best First'.
Re^4: Regex solution needed by ikegami (Patriarch) on Feb 23, 2007 at 20:13 UTC
The `\s` should probably be `\s+`, and `(?! \s+ fan ) (?! \s+ game ) (?! \s+ score ) (?! \s+ player )` [download] is slower than `(?! \s+ (?: fan \| game \| score \| player ) )` [download] This factors out the constant `\s+`, and it uses `\|` which probably has a lower overhead than `(?!...)`. Furthermore, alternations of constant strings can be highly optimized by re engine modifications demerphq added to 5.9. (I don't think those particular strings can be optimized, though.)	[reply] [d/l] [select]

Replies are listed 'Best First'.

Re^4: Regex solution needed
by ikegami (Patriarch) on Feb 23, 2007 at 20:13 UTC

The \s should probably be \s+, and

    (?! \s+ fan )
    (?! \s+ game )
    (?! \s+ score )
    (?! \s+ player )
[download]

    (?! \s+ (?: fan | game | score | player ) )
[download]

This factors out the constant \s+, and it uses | which probably has a lower overhead than (?!...). Furthermore, alternations of constant strings can be highly optimized by re engine modifications demerphq added to 5.9. (I don't think those particular strings can be optimized, though.)

[reply]
[d/l]
[select]