REGULAR EXPRESSION NOT SLASH CODE

Unlike programming languages like C# or Java, PHP does not require all backslashes in strings to be escaped. You would have to escape percentage sings if the regex contained any. The URL regex would be more readable as '% using percentage signs as the regex delimiters, since then you donвЂ™t need to escape the forward slashes. com/ becomes '/https://Just like Perl, the preg functions allow any non-alphanumeric character as regex delimiters.

When forward slashes are used as the regex delimiter, any forward slashes in the regular expression have to be escaped with a backslash. In PHP, this becomes preg_match('/regex/', $subject). In Perl, /regex/ defines a regular expression. The preg Function SetДЄll of the preg functions require you to specify the regular expression as a string using Perl syntax. mb_ereg is available in PHP 4.2.0 and later. If you want your regex to treat Far East characters as individual characters, youвЂ™ll either need to use the mb_ereg functions, or the preg functions with the /u modifier.

REGULAR EXPRESSION NOT SLASH CODE

While ereg treats the regex and subject string as a series of 8-bit characters, mb_ereg can work with multi-byte characters from various code pages.

The last set is a variant of the ereg set, prefixing mb_ for вЂњmultibyteвЂќ to the function names. The POSIX standard was defined in 1986, and regular expressions have come a long way since then. DonвЂ™t let the вЂњextendedвЂќ moniker fool you. Many of the more modern regex features such as lazy quantifiers, lookaround and Unicode are not supported by the ereg functions. They are officially deprecated as of PHP 5.3.0. These functions are mainly for backward compatibility with PHP 3. They implement POSIX Extended Regular Expressions, like the traditional UNIX egrep command. The oldest set of regex functions are those that start with ereg. PHP includes PCRE by default as of PHP 4.2.0 (April 2002). You should use the preg functions for all new PHP code that uses regular expressions. When the tutorial talks about PHP specifically, it assumes youвЂ™re using the preg functions. Anything said about the PCRE regex flavor in the regular expressions tutorial on this website applies to PHPвЂ™s preg functions.

These functions are a PHP wrapper around the PCRE library (Perl-Compatible Regular Expressions). The most important set of regex functions start with preg. PHP has three sets of functions that allow you to work with regular expressions. PHP is an open source language for producing dynamic web pages. PHP Provides Three Sets of Regular Expression Functions

Regular expression not slash