quotemeta in Substitutions quotemetais useful when doing literal string replacements. substitute.pl #!/usr/bin/perl use strict; use warnings; use v5.34.0; my $search = 'price: $100'; my $replace = 'cost: €85'; m
Perl是一种通用的脚本编程语言,其特点是具有强大的文本处理能力和灵活性。在Perl中,双连字符或字母数字处拆分是一种字符串处理技术,可以将字符串按照双连字符或字母数字的位置进行拆分。 这种拆分方式...
$string="Hello world";$char=substr($string,0,1);# get the first characterprint$char;# prints H$char=substr($string,-1);# get the last characterprint$char;# prints dsubstr($string,0,1)="J";# replace the first character with Jprint$string;# prints Jello worldsubstr($string,-5)="B...
countdown赋值为10 因此,以下代码将不能正常工作: sub count_down { You can't use 'macro parameter character #' in math modecountdown还未定义 }; my _, 0 } @castaways; # 编译错误 Extra open brace or missing close bracecastaway}++; print "castaway:tab{ 转储闭包:使用Data::Dump::Streamer...
URL-decode the string first # followed by reversing any special character ("+=/") translation. sub url_safe_base64_decode { my ($value) = @_; $value =~ s/%([0-9A-Fa-f]{2})/chr(hex($1))/eg; $value =~ tr|-_~|+=/|; my $result = decode_base64($value); return $...
-00 empty string, but “\n+” paragraph mode -0014 8-bit character, in octal form feed -0xC 8-bit character, in hex form feed -0400 undef, above 8-bit slurp -0777 undef, idiomatic slurp -g undef slurp, new in v5.36 -0x1FF \777 character, include -C actual \777 -0x2603 wide...
–`s/pattern/replacement/` – Search and replace a pattern in a string. –`tr/characters1/characters2/` – Transliterate characters in a string. –`grep /pattern/, @array` – Select array elements that match a pattern. –`split /pattern/, $string` – Split a string into an array base...
string boundary o Evaluates the expression only once s Allows use of . to match a newline character x Allows you to use white space in the expression for clarity g Replaces all occurrences of the found expression with the replacement text ...
Syntax: $string =~ /regular expression/expression modifier 例:$sentence =~ /Hello/ (a) Modifiers:修飾選項可有可無,它是用來對整個敘述作修正的。 (b) Metacharacter:下面這些字元都具有特殊意義,可以讓你建立更複雜的搜尋樣式(searching pattern)。
Table 3.1. Escape sequences in strings. Escape Sequence Description \a Bell (beep) \b Backspace \cn The Ctrl+n character \e Escape \E Ends the effect of \L, \U or \Q \f Form feed \l Forces the next letter into lowercase