How the regular should match data like Xf0x9fx91xab

I should be how to match \xf0\x9f\x91\xab. Please help! How to write an expression??

Reply to discussion (solution)

$s = "\xf0\x9f\x91\xab"; Var_dump (Preg_match ('/\xf0\x9f\x91\xab/', $s));

$s = "\xf0\x9f\x91\xab"; Var_dump (Preg_match ('/\xf0\x9f\x91\xab/', $s));

Then you can only match one AH. This is just one of them.

$s = "\xf0\x9f\x91\xab"; Var_dump (Preg_match ('/\xf0\x9f\x91\xab/', $s));

Then you can only match one AH. This is just one of them.
Please post the need to match all the content!!

$s = "\xf0\x9f\x91\xab"; Var_dump (Preg_match ('/\xf0\x9f\x91\xab/', $s));

Then you can only match one AH. This is just one of them.
Please post the need to match all the content!!
Like this: Hello, \xf0\x9f\x98\x83 I am very \xf0\x9f\x86\x93 today. This binary is not deterministic.

If your string is utf-8, I am not mistaken, \xf0\x9f\x98\x83, etc. is a delimiter, the entire string should only have several forms, should be considered as a character (no word, only the placeholder, the role of separation)
If your string comes from an API, you might want to check out the documentation for this API.

I have said it in another post of yours, but your perception is too bad
Rule string:/\xf0.../

$s = "This is just the test text \xf0\x9f\x98\x83 in the program, in fact the emoji are \xf0\x9f\x86\x93 in the inner code. ";p reg_match_all ('/\xf0.../', $s, $r); foreach ($r [0] as $v) echo current (unpack (' h* ', $v)), Php_eol;

f09f9883
f09f8693

I have said it in another post of yours, but your perception is too bad
Rule string:/\xf0.../

$s = "This is just the test text \xf0\x9f\x98\x83 in the program, in fact the emoji are \xf0\x9f\x86\x93 in the inner code. ";p reg_match_all ('/\xf0.../', $s, $r); foreach ($r [0] as $v) echo current (unpack (' h* ', $v)), Php_eol;

f09f9883
f09f8693
Oh, I'm going to do this with your method.

$text = "This is just the test text \xf0\x9f\x98\x83 in the program, in fact the emoji are \xf0\x9f\x86\x93 in the inner code. ";//callback function call ($matches) {  return" [Emoji] ". Bin2Hex ($matches [0])." [/emoji] ";} Echo preg_replace_callback (            "|\xf0...|",            "call",            $text);

