Question

我有一个变量如何在perl中使用正则表达式来检查字符串是否包含空格？例如：

$test = "abc small ThisIsAVeryLongUnbreakableStringWhichIsBiggerThan20Characters";

因此，对于此字符串，它应检查字符串中的任何单词是否不大于某些x字符。

Answer 1

#!/usr/bin/env perl

use strict;
use warnings;

my $test = "ThisIsAVeryLongUnbreakableStringWhichIsBiggerThan20Characters";
if ( $test !~ /\s/ ) {
    print "No spaces found\n";
}

请务必阅读Perl中的正则表达式。

Perl regular expressions tutorial - perldoc perlretut

Answer 2

你应该看看the perl regex tutorial。将他们的第一个“Hello World”示例调整为您的问题将如下所示：

if ("ThisIsAVeryLongUnbreakableStringWhichIsBiggerThan20Characters" =~ / /) {
    print "It matches\n";
}
else {
    print "It doesn't match\n";
}

Answer 3

die "No spaces" if $test !~ /[ ]/;        # Match a space
die "No spaces" if $test =~ /^[^ ]*\z/;   # Match non-spaces for entire string

die "No whitespace" if $test !~ /\s/;     # Match a whitespace character
die "No whitespace" if $test =~ /^\S*\z/; # Match non-whitespace for entire string

Answer 4

要查找最长的非空间字符序列的长度，请写下此

use strict;
use warnings;

use List::Util 'max';

my $string = 'abc small ThisIsAVeryLongUnbreakableStringWhichIsBiggerThan20Characters';

my $max = max map length, $string =~ /\S+/g;

print "Maximum unbroken length is $max\n";

<强>输出

Maximum unbroken length is 61

使用perl中的正则表达式匹配检查perl中的空格

4 个答案: