1--TEST-- 2Test preg_replace() function : basic 3--FILE-- 4<?php 5$string = '123456789 - Hello, world - This is a string.'; 6var_dump($string); 7 8var_dump(preg_replace('<- This is a string$>', 9 'This shouldn\'t work', $string)); //tries to find '- This is a string' at the end of a string but can't so replaces nothing and prints the unchanged $string. 10 11var_dump(preg_replace('<[0-35-9]>', 12 '4', $string, //finds any number that's not 4 and replaces it with a 4 13 '5', $count)); //limits to 5 replacements returns 444444789 14var_dump($count); //counts the number of replacements made (5) 15 16 17var_dump(preg_replace('<\b[hH]\w{2,4}>', 18 'Bonjour', $string)); //finds h or H at the beginning of a word followed by 2-4 characters and replaces it with Bonjour (i.e. Hello -> Bonjour) (was finding the 'his' in This and replacing it) 19 20var_dump(preg_replace('<(\w)\s*-\s*(\w)>', 21 '\\1. \\2', $string)); //finds dashes with an indefinite amount of whitespace around them and replaces them with a full stop precedeby no spaces and followed by one space 22 23var_dump(preg_replace('<(^[a-z]\w+)@(\w+)\.(\w+)\.([a-z]{2,}$)>', 24 '\\1 at \\2 dot \\3 dot \\4', 'josmessa@uk.ibm.com')); //finds the e-mail address and replaces the @ and . with "at" and "dot" (uses backreferences) ('josmessa at uk dot ibm dot com') 25?> 26--EXPECT-- 27string(54) "123456789 - Hello, world - This is a string." 28string(54) "123456789 - Hello, world - This is a string." 29string(54) "444444789 - Hello, world - This is a string." 30int(5) 31string(56) "123456789 - Bonjour, world - This is a string." 32string(42) "123456789. Hello, world. This is a string." 33string(30) "josmessa at uk dot ibm dot com" 34