PHP Miscellaneous Perl Compatible Regular Expressions Tutorial

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Tutorial: PHP Miscellaneous Perl Compatible Regular Expressions Tutorial

PHP string functions give you the ability to manipulate text but sometimes some manipulations get very complicated. Regular expressions (regex) give you more power and control than the normal string functions. On this tutorial we are going to review the u

Tutorial Details:

Compatible Regular Expressions

We are going to review three of the main regex functions:
1. preg_match() used to find text within a string
2. preg_match_all() used to find all matching occurrences of a search within a
string.
3. preg_replace() used to replace string matches with another text
4. preg_match()

To use preg_match() you need to establish 3 arguments; a regular expression, the source string and a array variable. preg_match() returns 1 if a match is found and 0 if no match is found.

Lets see the following example:
$text = "The boat is leaving";
if ( preg_match( "/b.*t/", $text, $array ) )
print $array[0]
// prints boat

Here our regular expression is "/b.*t/"; the source string is $text, and $array is where we store the result. As you can see the regex begins and ends with /.

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