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Oracle Tips by Burleson 

mixed preg_match ( string pattern, string subject [, array &matches [, int flags [, int offset]]])

This searches subject for a match to the regular expression given in pattern. If matches is provided, it is filled with the results of search. $matches[0] contains the text that matched the full pattern, $matches[1] has the text that matched the first captured parenthesized sub-pattern, and so on.

The function above uses practically the same pattern matching syntax as Perl because it uses PCRE (Perl Compatible Regular Expressions) library as the pattern matching engine.  The preg_matchfunction is not the only PCRE function implemented in PHP, it is one of several functions. The other PCRE functions are:

  • preg_grep

  • preg_match_all

  • preg_match

  • preg_quote

  • preg_replace_callback

  • preg_replace

  • preg_split

These functions are very well documented in the online documentation on the PHP home page, http://www.php.net.

Regular expression syntax is quite an extensive subject covered in several books and is beyond the scope of this book. Detailed documentation for PCRE library can be found on http://www.pcre.org.   Probably, the best introductory document for Perl’s regular expression syntax is the legendary “llama book”, Learning Perl by Randal Schwartz and Tom Phoenix.

Mastering regular expressions is wholeheartedly recommended not just because they are extremely useful in scripting languages like PHP and Perl; they are also supported by the latest and the greatest version of Oracle RDBMS, Oracle 10g.

This completes supplied functions in this chapter. The additional functions are introduced later in this book and are explained with detailed examples.  PHP5 is a scripting language that borrows its philosophy from C. The syntax is extremely simple, yet very powerful, while the additional complexities a placed in the functions instead in the syntax. One of the things that make Perl rather complex and difficult to learn is its syntax with a multitude of operators, expression syntaxes, built-in variables and language idioms. PHP has none of that. Complexities of regular expressions are placed in functions, as is the case with most of other things.


See code depot for complete scripts


The above book excerpt is from:

Easy Oracle PHP

Create Dynamic Web Pages with Oracle Data

ISBN 0-9761573-0-6   

Mladen Gogala

http://www.rampant-books.com/book_2005_2_php_oracle.htm

 

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