I want to get 344747585151010c745359555d581a575b59 from the string.
[a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="344747585151010c745359555d581a575b59"]
I'm tried the following PHP to capture it:
preg_match_all("/<a [^>]*data-cfemail=\"?([^\">]+)\"?>/", $input_lines, $output_array);
You don't have less than or greater than symbols in your string. Try:
data-cfemail="?([^"\]]+)(?:"|])
Demo: https://regex101.com/r/JoImnS/2/
Note, this regex is looser than it could be. I assumed the double quotes encapsulating the data-cfemail were optional, if not this can be simplified.
You can make use of a positive look-behind on the data-cfemail, and then simply match any digit or lowercase letter that comes directly after that:
/(?<=data-cfemail=")[\da-z]+/
Breaking this down:
(?<=data-cfemail=") - match anything that follows data-cfemail="[\da-z] - match any digit or lowercase letter+ - match one or more of the digits / lowercase letterspreg_match("/(?<=data-cfemail=")[\da-z]+/", $input_line, $output_array);
Returns:
array(1
0 => 344747585151010c745359555d581a575b59
)
This can be seen working on PHPLiveRegex here.