Need the ^ and $ to denote the begin and end, otherwise if the string has a match in the middle, such as @@@xyz%%%% then it is still a match. \w already includes alphabets (upper and lower case), numbers, and underscore. So the rest ., -, are just put into the "class" to...
It should however be noted that if you want to find out if the address actually refers to an existing mailbox, there's no substitute for sending a message to the address. If you only want to check if an address is grammatically correct then you could use a regular expression...
//Donot uncomment any line. dare not uncommenting any line untill permission granted. // Donot use the access key and the function verify() untill permission granted. // set endpoint and your access key varaccess_key ='my_key'; varemail_address; varvalid_format, smtp_check, disposable,...
The character class is also known as character sets, and this is used to tell the regex engine to look for a single match out of several characters. A character class will match only one character and the order of the characters enclosed inside the character set doesn’t matter. Grouping R...
If you want to get fancy and pedantic, implement a complete state engine. A regular expression can only act as a rudimentary filter. The problem with regular expressions is that telling someone that their perfectly valid e-mail address is invalid (a false positive) because your regular expr...