/usr/bin/perl$age =25;# An integer assignment$name ="John Paul";# A string$salary =1445.50;# A floating pointprint"Age = $age\n";print"Name = $name\n";print"Salary = $salary\n";12345678 这将产生以下结果 - Age = 25 Name = John Paul Salary = 1445.5 1234 数组变量 数组是存储标...
ref EXPR ref Returns a non-empty string if EXPR is a reference, the empty string otherwise. If EXPR is not specified, $_ will be used. The value returned depends on the type of thing the reference is a reference to. Builtin types include: SCALAR ...
字符串(string) length:得到字符串的长度 例:print length‘HELLO’; printf:格式化字符串 例:printf “%.4f\n”,$value; substr:得到字符串子串 例:print substr($text,7,4); 比较字符串: eq 左右相等为真 ne 左右不相等为真 cmp 左边小于等于大于右边 返回-1 0 1 lt 左边小于右边 为真 gt 左边大与...
数组长度: length($string) substr 语法:substr($string,offset,length) offset代表起始字符的位置,length代表引用的字符串长度,如果省略length则代表从起始值到字符串的最后一个字符长度。而offset如果是负值的话,就会从字符串右边开始指定字符。 示例: $s=substr("perl5",2,2);#这时$s="rl";$s=substr("perl...
# Original string my $originalstring = "Our site srcmini provides all type of tutorials"; print "$originalstring\n"; # Offset of 4 my $offset = substr($originalstring, 4); print "$offset\n"; # Offset of 4, length 15 my $offsetlength = substr($originalstring, 4, 15); ...
say length $text; use bytes; say length $text; The example splits a string consisting of emoticons and then prints each emoticon separately on the console. say length $text; We get the size of the string in characters withlength.
importpyodbcimportpsycopg2 ...try: conn_string = ‘postgresql+psycopg2://’+ conn_user+’:’+conn_password+’@’+conn_server+’/’+conn_database conn = pyodbc.connect(conn_string, connect_args={‘options’...
my $string="world";print $string; # "world" 1. 2. (引用的用法稍后讲述。) 用.操作符实现字符串的链接(和PHP一样): 复制 print "Hello ".$string; # "Hello world" 1. 布尔值(Booleans) Perl 没有布尔数据类型。只有如下几种值才能在 if 判断语句中返回 'false' : ...
###ifthelengthisnotthemultipleof3,trimtheredundantchars $trim=length($cn)%3; ###getthesubstring my$retval=substr($str,0,$maxlen-$trim); ###recursiontogettheremainstring return"$retval ".&substring(substr($str,$maxlen-$trim),$maxlen); ...
zero or one of the previous thing {3} matches exactly 3 of the previous thing {3,6} matches between 3 and 6 of the previous thing {3,} matches 3 or more of the previous thing Some brief examples: /^\d+/ string starts with one or more digits /^$/ nothing in the string (start...