PHP正则表达式从JS函数中提取经度和纬度
[英]PHP regex expression extract latitude & longitude from JS function
问题描述
I am using the simple_html_dom PHP library to scrape some content of a page. 
我正在使用simple_html_dom PHP库来抓取页面的某些内容。 I would like to extract the latitude and longitude from the page but I need a regex expression to access these value since these values are only available on the page in a Javascript function: 我想从页面中提取纬度和经度，但是我需要一个正则表达式来访问这些值，因为这些值仅在Javascript函数中的页面上可用：
function loadMap() { setTimeout("setMap(39.364016, 3.226783, 'Hotel Casa',
'icon.png', 'key')", 200)};
I got the above example in a string. 我得到了上面的示例字符串。 What would be a well optimized regex expression (using PHP) to extract the latitude (39.364016) and the longitude (3.226783) from this string? 一个很好优化的正则表达式（使用PHP）从该字符串中提取纬度（39.364016）和经度（3.226783）是什么？ I am new to regex expressions so my attempts so far have not been successful, I hope someone could can help me out. 我是regex表达式的新手，所以到目前为止，我的尝试还没有成功，我希望有人可以帮助我。 Thank you. 谢谢。
4 个解决方案
解决方案1
1 2017-09-04 16:04:25
Use this regex: 使用此正则表达式：
/setMap\((\-?\d+\.?\d*), ?(\-?\d+\.?\d*)/
Details 细节
setMap\( match that string, literally, with the open parentheses
\-? optional minus symbol
\d+ a digit, one or more times
\.? a literal dot, optional (in the rare case you get an integer)
\d a digit, 0 or more times (in the rare case you get an integer)
, ? an comma followed optionally by a space
解决方案2
1 已采纳 2017-09-04 16:06:53
Using named captures, which you might find a bit clearer: 使用命名捕获，您可能会发现它更清晰一些：
<?php
$html = <<<HTML
<html>
...
function loadMap() { setTimeout("setMap(39.364016, 3.226783, 'Hotel Casa',
'icon.png', 'key')", 200)};
...
</html>
HTML;
$regex = '/setMap\((?P<latitude>[0-9\.\-]+), (?P<longitude>[0-9\.\-]+)/';
$matches = [];
preg_match($regex, $html, $matches);
echo "Latitude: ", $matches['latitude'], ", Longitude: ", $matches['longitude'];
// Latitude: 39.364016, Longitude: 3.226783
解决方案3
0 2017-09-04 16:03:07
你可以试试
/[0-9]{1,3}[.][0-9]{4,}/
解决方案4
0 2017-09-04 17:01:12
Optimized and regex doesn't really go hand in hand with this simple parsing. 优化和正则表达式实际上与这种简单的分析并没有紧密结合。
Here is a "optimized" solution using Substr and strpos. 这是使用Substr和strpos的“优化”解决方案。
$str = <<<EOD
function loadMap() { setTimeout("setMap(39.364016, 3.226783, 'Hotel Casa',
'icon.png', 'key')", 200)}
EOD;
$pos = strpos($str, "setMap(") + 7; //find position of setMap(
$latlon = Substr($str, $pos, strpos($str, ", '")-$pos); // substring from setMap to `, '`
List($lat, $lon) = explode(", ", $latlon); // explode the latlon to each variable.
Echo $lat . " " . $lon;
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