Don’t use a regex when you don’t need to 🙂 $valid = filter_var($string, FILTER_VALIDATE_IP); Though if you really do want a regex… $valid = preg_match(‘/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\z/’, $string); The regex however will only validate the format, the max for any octet is the max for an unsigned byte, or 255. This is why IPv6 is necessary – … Read more
You want something like: %^((https?://)|(www\.))([a-z0-9-].?)+(:[0-9]+)?(/.*)?$%i this is using the | to match either http:// or www at the beginning. I changed the delimiter to % to avoid clashing with the |
preg_match(‘/[^\d]+/’, $string, $textMatch); preg_match(‘/\d+/’, $string, $numMatch); $text = $textMatch[0]; $num = $numMatch[0]; Alternatively, you can use preg_match_all with capture groups to do it all in one shot: preg_match_all(‘/^([^\d]+)(\d+)/’, $string, $match); $text = $match[1][0]; $num = $match[2][0];
Use non greedy modifier ? : preg_match(“/\{\{(.*?)\}\}/si”,$content,$matches); here –^
You use the start and end markers, ^ and $ respectively, to indicate beginning and end of the string in your regular expression pattern. That way you can make the expression match only the whole string, not any kind of substring. In your case it would then look like this: preg_match(“#^[a-z]*$#”, “333k”); You can also, … Read more
Add the UTF-8 modifier flag (u) to your expression: /^\p{L}+$/ui There is also no need to wrap \p{L} inside of a character class.
I suggest you use the FILTER_VALIDATE_EMAIL filter: if (filter_var($email, FILTER_VALIDATE_EMAIL)) { //valid } You can also use its regular expression directly: “/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD” But in that case, if a bug is found in the regular expression, you’ll have to update your program instead of just updating PHP.
The simplest way to test if a string is a regex is: if( preg_match(“/^\/.+\/[a-z]*$/i”,$regex)) This will tell you if a string has a good chance of being intended to be as a regex. However there are many string that would pass that check but fail being a regex. Unescaped slashes in the middle, unknown modifiers … Read more
Cannot Be Done I’m sorry, but this “problem” is truly impossible to solve. Consider these: ꜰᴜᴄᴋ is U+A730.1D1C.1D04.1D0B, “\N{LATIN LETTER SMALL CAPITAL F}\N{LATIN LETTER SMALL CAPITAL U}\N{LATIN LETTER SMALL CAPITAL C}\N{LATIN LETTER SMALL CAPITAL K}” ᶠᵘᶜᵏ is U+1DA0.1D58.1D9C.1D4F, “\N{MODIFIER LETTER SMALL F}\N{MODIFIER LETTER SMALL U}\N{MODIFIER LETTER SMALL C}\N{MODIFIER LETTER SMALL K}” 𝒻𝓊𝒸𝓀 is U+1D4BB.1D4CA.1D4B8.1D4C0, “\N{MATHEMATICAL … Read more
Simple PHP HTML Dom Parser example: // Create DOM from string $html = str_get_html($links); //or $html = file_get_html(‘www.example.com’); foreach($html->find(‘a’) as $link) { echo $link->href . ‘<br />’; }