如何使用 REGEX 将其他两个已知字符串之间的字符串匹配，而没有其他字符串 - How can I match a string between two other known strings and nothing else with REGEX?

How can I match a string between two other known strings and nothing else with REGEX?

我想在另外两个字符串之间提取一个字符串。字符串碰巧在 HTML 标签中，但我想避免讨论我是否应该使用正则表达式解析 HTML（我知道我不应该并且已经解决了 stristr（）的问题），但想知道如何使用正则表达式来做到这一点。

字符串可能如下所示：

...uld select “Apply” below. Primary Location: United States-Washington-Seattle Travel: Yes, 75 % of the Time Job Type: Standard Region: US Service Lines: ASL - Business Intelligence Job: Business Intelligence Capability Group: Con/Sol - BI&C LOC:USA

我对Primary Location: United States-Washington-Seattle 感兴趣，想提取"美国-华盛顿-西雅图"

我尝试了'(?<=Primary Location:)(.*?)(?= )'在 RegExr 中工作但不适用于 PHP：

preg_match("/(?<=Primary Location:)(.*?)(?= )/", $description,$matches);

您使用/作为正则表达式分隔符，因此如果要从字面上匹配它或使用其他分隔符，则需要对其进行转义

 preg_match("/(?<=<b>Primary Location</b>:)(.*?)(?=<br/>)/", $description,$matches);

自

preg_match("/(?<=<b>Primary Location<'/b>:)(.*?)(?=<br'/>)/", $description,$matches);

或者这个

preg_match("~(?<=<b>Primary Location</b>:)(.*?)(?=<br/>)~", $description,$matches);

更新

我刚刚在 www.writecodeonline.com/php 上测试了它，并且

$description = "uld select “Apply” below.<br/><br/><b>Primary Location</b>: United States-Washington-Seattle<br/><b>Travel</b>: Yes, 75 % of the Time <br/><b>Job Type</b>: Standard<br/><b>Region</b>: US Service Lines: ASL - Business Intelligence<br/><b>Job</b>: Business Intelligence<br/><b>Capability Group</b>: Con/Sol - BI&C<br/><br/>LOC:USA";
preg_match("~(?<=<b>Primary Location</b>:)(.*?)(?=<br/>)~", $description, $matches);
print_r($matches);

正在工作。输出：

数组（ [0] => 美国-华盛顿-西雅图
[1] => 美国-华盛顿-西雅图）

您也可以摆脱捕获组并执行

$description = "uld select “Apply” below.<br/><br/><b>Primary Location</b>: United States-Washington-Seattle<br/><b>Travel</b>: Yes, 75 % of the Time <br/><b>Job Type</b>: Standard<br/><b>Region</b>: US Service Lines: ASL - Business Intelligence<br/><b>Job</b>: Business Intelligence<br/><b>Capability Group</b>: Con/Sol - BI&C<br/><br/>LOC:USA";
preg_match("~(?<=<b>Primary Location</b>:).*?(?=<br/>)~", $description, $matches);
print($matches[0]);

输出

美国-华盛顿-西雅图