extractres(1) factor(1) factor(1g) false(1) false(1g) faqpods(1) fastboot(1B) fasthalt(1B) fc-cache(1) fc-cat(1) fc-list(1) fc-match(1) fc-query(1) fc-scan(1) fc(1) fetchmail(1) fetchmailconf(1) fg(1) fgrep(1) fgrep(1g) file(1) file(1B) filebench(1) filep(1...
Returns the number of files successfully changed. See also "oct", if all you have is a string. $cnt = chmod 0755, "foo", "bar"; chmod 0755, @executables; $mode = "0644"; chmod $mode, "foo"; # !!! sets mode to # --w---r-T $mode = "0644"; chmod oct($mode), "foo"...
my $str1="4G";my $str2="4H";print $str1 . $str2; # "4G4H"print $str1 + $str2; # "8" with two warningsprint $str1 eq $str2; # "" (empty string, i.e. false)print $str1== $str2; # "1" with two warnings# The classic errorprint "yes" == "no"; # "1" with ...
BTW, "extract the sign and convert to UV" is a common pattern in Perl code. I experimented with a similar snippet extracted from pp_multiply, I tried to make the IV part branchless, but it turned out to be a pessimization. On my PC, the branchless version is 2x slower. The bench...
while$&slows it down to a lesser extent, because if they are used in one regexp in a program, they are generated forallregexps in the program. So if raw performance is a goal of your application, they should be avoided. If you need to extract the corresponding substrings, use"@-"an...
Okay, how do I extract a complete number, like the year? $mystring = "[2004/04/13] The date of this article."; if($mystring =~ m/(\d+)/) { print "The first number is $1."; } Prints "The first number is 2004." First, when one says "complete number", one really means...
That's because Perl uses an internal representation offalsethat is both a numeric zero and an empty string at the same time. When used in a string context, the empty string is printed. In a numeric context, the zero is used. Whengetting or setting an attribute value, the DBI automaticall...
it should never be necessary to do this. Whether a scalar behaves like a number or a string depends on the operator with which it is used. When used as a string, a scalar will behave like a string. When used as a number, a scalar will behave like a number (raising a warning if ...
For consistency, A in unpack() format now trims all Unicode whitespace from the end of the string. Before perl 5.9.2, it used to strip only the classical ASCII space characters. Byte/character count feature in unpack() A new unpack() template character, ".", returns the number of bytes...
()"to extract the required sort key into a consistent string can be an efficient way to build a single string to compare, instead of using multiple sort keys, which makes it possible to use the standard, written in"c"and fast, perl"sort()"function on the output, and is the basis of...