如何匹配两个其他已知字符串之间的字符串，而没有其他字符与REGEX？

Question

我想提取两个其他字符串之间的字符串。字符串恰好在HTML标签内，但我想避免关于是否应该使用正则表达式解析HTML的对话（我知道我不应该用stristr（）解决问题，但想知道如何去做。与

正则表达式的字符串可能是这样的：

...uld select &#8220;Apply&#8221; 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

我感兴趣的<b>Primary Location</b>: United States-Washington-Seattle<br/>并要提取“美国华盛顿州西雅图”

我试图'(?<=<b>Primary Location</b>:)(.*?)(?=<br/>)'其工作在RegExr但不是PHP：

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

Answer 1

您使用/为正则表达式的分隔符，所以你需要逃避它，如果你想从字面上匹配，或使用不同的分隔符

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

到

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

或此

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

更新

我只是测试它在www.writecodeonline.com/php和

$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); 

工作。输出：

阵列（[0] =>美国华盛顿州西雅图[1] =>美国华盛顿州西雅图）

您也可以摆脱捕获组和做

$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

美国华盛顿座tle