phone number validation in php using regular expression

On regular expressions, regular expressions First, what is a regular expression? Simply put: Regular expressions (Regular expression) is a language that handles string matching; A regular expression describes a pattern of string matches that can be

They all take a regular expression as their first argument, listed as follows: Ereg: The most commonly used regular expression function, Ereg allows us to search for a string that matches a regular expression. Ereg_replace: Allows us to search for

PHP code $STR = Preg_replace ("/() (. *?) ()/", ' \1\2\3", $str); The uses three sub modes (one in each parenthesis), the first one is the link start tag, the second is the link text, and the third is then \1, \2, and \3 in the second argument,

PHP and regular expressions. A regular expression from a swords blog is a specific format that can be used to identify the usage of a string in another string. Several programming languages, including blogs from swords A regular expression is a

Regular expressions for string processing, form verification, and other occasions, practical and efficient. This article collects some common expressions: $str = Preg_replace ("/( ) (. *?) ()/", ' \1\2\3 ', $str); It uses three sub

Regular expressions provide a powerful way to work with text. With regular expressions, you can perform complex validation of user input, parse user input and file content, and reformat strings. PHP provides users with a simple way to use POSIX and

The following is about the small series for everyone to collect and organize the regular expression of PHP, the specific content please see below detailed $str = Preg_replace ("/() (. *?) ()/", ' \1\2\3 ', $str); It uses three sub

Basic knowledge CharacterPOSIX Extended Regular Expression functionsPerl-compatible Regular expression functionsFrom the message verification. The format of the message: Tenssun@163.com Where Tenssun is the user name, 163.com is the server name

From: Swords's Blog A regular expression is a specific format pattern that can be used to find out the use of a string in another string. Several programming languages, including Visual Basic,perl,javascript and PHP, support regular expressions,

Blog from: swordsA regular expression is a specific format that can be used to identify the usage of a string in another string. Several programming languages, including Visual Basic, Perl, javascript, and PHP, support regular expressions. I hope