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preg_match('/<div class="prices">/s<h3>(.+?)<\/h3>/is', $response, $matches);
There's whitespace and potentially new lines between the prices div and the h3 tag. How do I use /s to match that?
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\s stands for “whitespace character”. Again, which characters this actually includes, depends on the regex flavor. In all flavors discussed in this tutorial, it includes [ \t\r\n\f]. That is: \s matches a space, a tab, a carriage return, a line feed, or a form feed.
The RegExp \s Metacharacter in JavaScript is used to find the whitespace characters. The whitespace character can be a space/tab/new line/vertical character. It is same as [ \t\n\r].
You also need to use regex \\ to match "\" (back-slash). Regex recognizes common escape sequences such as \n for newline, \t for tab, \r for carriage-return, \nnn for a up to 3-digit octal number, \xhh for a two-digit hex code, \uhhhh for a 4-digit Unicode, \uhhhhhhhh for a 8-digit Unicode.
You don't use /s, you use \s*.
\), not a slash (/).* afterwards means that it matches zero or more whitespace characters.Also, please consider using an HTML parser if you are trying to find HTML tags. A proper HTML parser will be able to correctly handle whitespace, HTML comments and other features of HTML that your regular expression cannot handle.
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