则读者向Perl承诺$regex将不会改变。如果改变了,Perl将不会注意读者的改变。因而, $regex = 'b'; while ('bbbbb' =~ m" $regex o) { $regex = 'c';} 实际上是Perl中的一个无限循环。$regex改变了。但是在正则表达式中没有反映(然而,在每个程序中这没有限制用户用一个而且仅仅一个regexp。带有o
AI代码解释 my%input_file="xxx.log"; 改成: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 my $input_file="xxx.log"; 可以运行: 这里没有支持中文,所以出现了乱码,但是在第 3 和第 4 行都打印了 fail 字符串,这是什么原因呢? 代码语言:javascript 代码运行次数:0 运行 AI代码解释 print"匹配...
POSIX标准的regex库总共就4个函数regcomp,regerror,regexec,regfree. 我们知道 regexec 不能通过一次调用...
我想在输出中搜索以下Perl的Regex搜索CamelCase单词,这样我就可以主动监控输出。 /\b([a-z]*[A-Z][a-z]*){2,}\b/ 看答案 我在GNU /屏幕中测试并检查了源代码。两者都认为这是不可能的。搜索功能似乎仅支持基本字符串匹配。 我建议的是你使用的是 tee 除了打印它之外,命令要将程序的输出发送到文件...
Perl grep regexRegular expressions can be used to filter data. digits.pl #!/usr/bin/perl use v5.34.0; use warnings; my @vals = ("sky", 0, -1, "cup", "breed", "345", 12); my @res = grep /\d/, @vals; say "@res"; In the example, we use the \d regular expression ...
They can make the regex execution faster and simpler do understand. Basic Linting with perlcriticYou can use perlcritic to avoid some runtime errors and style issues, it's far from perfect or fixing the issues dynamic languages have in general, but it's also better than nothing by a lot....
my $regex = shift; print grep { $_ =~ /$regex/ } <>; 第一行从命令行读入一个正则表达式,命令行其它参数应该是文件名。钻石操作符<>从所有文件(命令行参数)中提取每一行。grep根据正则式进行过滤。通过过滤的行会打印出来。Windows上的grep...
Unlike Perl 5, a variable placed inside a regex does not automatically interpolate the value of the variable. What happens with the variable depends on context (this is perl after all :-). An "unadorned" variable will interpolate as a literal string to match if it's a scal...
Perl-regex不区分大小写,但它应该区分大小写正如在注解中提到的,==是错误的运算符,应该使用eq来比较...
Statement EndIn Perl Statement ends with;While in Python; is not required to endthe program statement as it deals with whitespaces.5. Regular ExpressionPerl is a part of the language which makes text processing easy and short. While Python need to deal with functions and method for regex6....