使用php检查字符串中的10位数字

Question

我想使用php在以下字符串中检查10位数字

$str1 = "when an unknown 8109100000 remaining essentially unchanged.";
$str2 = "when an unknown remaining essentially unchanged.";

找到10位数字后返回true

Answer 1

您可以使用preg_match

码

    $str1 = "when an unknown 8109100000 remaining essentially unchanged.";
    $str2 = "when an unknown remaining essentially unchanged.";
    $pattern = "/\b\d{10}\b/";
    $isNum = preg_match($pattern,$str1, $match); //return 1 $str2 return 0.
    if($isNum){
     //Do something
    }
    else{
    //Aww.... No number in string.
    }
echo $match[0]; //return matched number.

演示版

阅读有关preg_match正则 表达式的更多信息

Answer 2

为了只匹配精确的10位数字，您需要在正则表达式模式中将{}与\\b组合在一起。
{}指定位数， \\b表示匹配完整的单词。

在此示例中，仅最后一个字符串应返回true / 1。

$str = ["when an unknown 810910000011 remaining essentially unchanged.",
        "when an unknown remaining essentially unchanged.",
        "when an unknown 8109100000 remaining essentially unchanged."];

Foreach($str as $s){
    Echo preg_match("/\b\d{10}\b/", $s) . "\n";
}

它输出

0
0
1

符合预期

https://3v4l.org/QesPA