How do I compare two strings in Perl? (7 个回答) 已关闭 5 年前。 我(一个完全的 Perl 新手)正在 if 中进行字符串比较声明: 如果我执行以下操作: if ($str1 == "taste" && $str2 == "waste") { } 我看到了正确的结果(即,如果条件匹配,它将评估“then” block )。但我看到这些警告: ...
1abc and 1xyz are equal Compare two numbers using ne 1 and 1 are equal Compare two strings using ne 1abc and 1xyz are not equal
o "ibcmp_utf8(s1, pe1, l1, u1, s2, pe2, l2, u2)" can be used to compare two strings case-insensitively in Unicode. For case-sensitive comparisons you can just use "memEQ()" and "memNE()" as usual. For more information, see perlapi, and utf8.c and utf8.h in the Perl...
How to compare two strings case insensitive3.7.4. How to convert all the array elements in lowercase3.8. Perl lcfirst function3.8.1. The syntax forms3.8.2. How to convert the first character of a string in lowercase3.9. Perl length functionCopyright 漏 misc-perl-info.com3.9.1. The syntax...
Using the wrong comparison operator is a common Perl coding error, and is frustrating to debug. For example, if you use the==operator to compare two strings, you will not get the expected result. You can also test certain fileconditions, such as whether or not files exist, the type of ...
For example, if you wanted to compare two numbers, but you omitted the second = character so that you had something like if ($yes = 1) instead of if ($yes = = 1), with warnings enabled, Perl will warn you that you may have meant = =. The next level is when the program does ...
When you have otherwise equivalent strings, at least some of which contain Unicode combining character sequences, instead of comparing them directly, compare the results of running them through the NFD( ) function from the Unicode::Normalize module. use Unicode::Normalize; $s1 = "fa\x{E7}ade...
Compare, for example, the Dockerfile for Sqitch, the database change management system I wrote and maintain in Perl. It’s…a lot. Sure there are a ton of system dependencies, but what’s invisible in this file is the weeks of work that went into Module::Build::Sqitch, which performs...
* available to compare two wide character strings. */ #$d_wcscmp HAS_WCSCMP /**/ /* HAS_WCSXFRM: * This symbol, if defined, indicates that the wcsxfrm routine is * available to tranform a wide character string for wcscmp(). */ #$d_wcsxfrm HAS_WCSXFRM /**/ /* HAS_WRITEV: *...
Devel::Peek shows that the first two values have a BOOL flag. Compare those to the last dump, which does not have the boolean value: 01 SV = PVNV(0x7fcd72809850) at 0x7fcd74008b00 02 REFCNT = 1 03 FLAGS = (IOK,NOK,POK,IsCOW,pIOK,pNOK,pPOK) 04 IV = 1 05 NV = 1 06 PV...