{"id":739,"date":"2012-06-05T08:32:43","date_gmt":"2012-06-05T08:32:43","guid":{"rendered":"http:\/\/www.withinweb.com\/info\/?p=739"},"modified":"2012-06-20T13:26:32","modified_gmt":"2012-06-20T13:26:32","slug":"regular-expressions-part-4-array-processing","status":"publish","type":"post","link":"https:\/\/www.withinweb.com\/info\/regular-expressions-part-4-array-processing\/","title":{"rendered":"Regular Expressions Part 4 – Array Processing"},"content":{"rendered":"

PHP’s preg_split() function enables you to break a string apart basing on something more complicated than a literal sequence of characters. When it’s necessary to split a string with a dynamic expression rather than a fixed one, this function comes to the rescue. The basic idea is the same as preg_match_all() except that, instead of returning matched pieces of the subject string, it returns an array of pieces that didn’t match the specified pattern. The following example uses a regular expression to split the string by any number of commas or space characters:<\/p>\n

<?php
\n‘——————————————————
\n$keywords = preg_split(“\/[\\s,]+\/”, “php, regular expressions”);
\nprint_r( $keywords );
\n‘——————————————————
\n?><\/p>\n

Another useful PHP function is the preg_grep() function which returns those elements of an array that match a given pattern. This function traverses the input array, testing all elements against the supplied pattern. If a match is found, the matching element is returned as part of the array containing all matches. The following example searches through an array and all the names starting with letters A-J:<\/p>\n

<?php
\n‘——————————————————
\n$names = array(‘Andrew’,’John’,’Peter’,’Nastin’,’Bill’);
\n$output = preg_grep(‘\/^[a-m]\/i’, $names);
\nprint_r( $output );
\n‘——————————————————
\n?><\/p>\n","protected":false},"excerpt":{"rendered":"

PHP’s preg_split() function enables you to break a string apart basing on something more complicated than a literal sequence of characters. When it’s necessary to split a string with a dynamic expression rather than a fixed one, this function comes…<\/span><\/p>\n

Read more Regular Expressions Part 4 – Array Processing<\/span> ›<\/span><\/a><\/div>\n

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