Re^2: Regex question

~~This will never match and is completly wrong as you mixed up $var1 and $var2.~~

~~It should be~~

~~index( $var2, $var1 ) == 0~~

~~but this will still be~~ wrong because

$var2='1.11.2';
$var1='1.1';
[download]

would give you a false match

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

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Re^3: Regex question by BrowserUk (Patriarch) on May 22, 2007 at 13:42 UTC
This will never match and is completly wrong as you mixed up $var1 and $var2. Um, no. `C:\parrot>p1 [0] Perl> $var1 = '1.1.2'; $var2 = '1.1'; if( index( $var1, $var2 ) == 0 ) { print "matches" } else { print "Doesn't match" };; matches [0] Perl> $var1 = '1.1.2'; $var2 = '1.1'; if( index( $var2, $var1 ) == 0 ) { print "matches" } else { print "Doesn't match" };; Doesn't match` [download] but this will still be wrong because `$var2='1.11.2'; $var1='1.1';` [download] would give you a false match That's a good catch though. It's also easily fixed: `[0] Perl> $var1 = '1.11.2'; $var2 = '1.1'; if( index( $var1, "$var2." ) == 0 ) { print "matches" } else { print "Doesn't match" };; Doesn't match` [download] Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. "Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."	[reply] [d/l] [select]
Re^4: Regex question by Skeeve (Parson) on May 22, 2007 at 22:47 UTC
Indeed! I mixed it up, not you. But your fix doesn't help with: `$var2='1.1'; $var1='1.1';` [download] It will give you a false negative ;-) See my solution above which handle both cases. `s$$([},&%#}/&/]+}%&{});#$&&s&&$^X.($'^"%]=\&(\|?{%` `+`.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e	[reply] [d/l] [select]