查找字符串中给定值的出现次数?

时间:2013-03-28 07:53:52

标签: php regex string

考虑如下字符串。

$string="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 5000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";

我必须找出这个字符串中有多少个数字。但是这个数字等于1000且高于1000,然后是$符号。

示例:1000美元(或)1000美元(或)1000美元(或)1000美元以上仅1000美元。

3 个答案:

答案 0 :(得分:1)

使用preg_match_all()和foreach循环:

$string="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 50000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";

preg_match_all('/(\$\s?)(?P<before>\d{4,})|(?P<after>\d{4,})(\s?\$)/', $string, $m);

$tmp = array_filter($m["before"]) + array_filter($m["after"]);
$number = array();
foreach($tmp as $n){
    if($n >= 1000){
        if(isset($number[$n])){
            $number[$n]++;
        }else{
            $number[$n] = 1;
        }
    }
}

print_r($number);
// Key => number, value => n occurences

我已使用\d{4,}来匹配1000位或更高位的4位数字,但比方说有一个像0500这样的数字,这也将匹配。所以我用foreach循环来过滤数字。

答案 1 :(得分:0)

<?php
$string="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 5000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";
$pattern = "#([$][\s]*)?([1-9]\d{3})([\s]*[$])?#";
//(?<=$|$\s)
//(?=$|\s$)
preg_match_all($pattern, $string, $out);
print_r($out[2]);

Array
(
    [0] => 1000
    [1] => 2000
    [2] => 1020
    [3] => 5000
    [4] => 2000
    [5] => 3000
)

答案 2 :(得分:0)

试试这个:

$string  ="Lorem ipsum $ 1000 ,ipsum $2000 sopr $250 gerb $ 150 dfkuer fsdf erwer 1020 $ gsdfasdtwe qw $ 5000 efk kdfgksgdf 2000 $ sdhfgsd fsdf 620 $ sdfjg jsdf3000$";

preg_match_all('/\$\s?(?P<pr>\d{4,})|(?P<fl>\d{4,})\s?\$/',$string,$match);
$res     = array_merge(array_filter($match['pr']),array_filter($match['fl']));

echo "<pre>";
print_r($res);

输出:

Array
(
    [0] => 1000
    [1] => 2000
    [2] => 5000
    [3] => 1020
    [4] => 2000
    [5] => 3000
)