1--TEST--
2Test preg_replace() function : basic
3--FILE--
4<?php
5/* Prototype  : proto string preg_replace(mixed regex, mixed replace, mixed subject [, int limit [, count]])
6 * Description: Perform Perl-style regular expression replacement.
7 * Source code: ext/pcre/php_pcre.c
8 * Alias to functions:
9*/
10
11$string = '123456789 - Hello, world -           This is a string.';
12var_dump($string);
13
14var_dump(preg_replace('<- This is a string$>',
15                      '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.
16
17var_dump(preg_replace('<[0-35-9]>',
18                      '4', $string,               					//finds any number that's not 4 and replaces it with a 4
19			    '5', $count));							//limits to 5 replacements returns 444444789
20var_dump($count);											//counts the number of replacements made (5)
21
22
23var_dump(preg_replace('<\b[hH]\w{2,4}>',
24                      '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)
25
26var_dump(preg_replace('<(\w)\s*-\s*(\w)>',
27                      '\\1. \\2', $string));						//finds dashes with an indefinite amount of whitespace around them and replaces them with a full stop precedeby no spaces and followed by one space
28
29var_dump(preg_replace('<(^[a-z]\w+)@(\w+)\.(\w+)\.([a-z]{2,}$)>',
30                      '\\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')
31?>
32--EXPECTF--
33string(54) "123456789 - Hello, world -           This is a string."
34string(54) "123456789 - Hello, world -           This is a string."
35string(54) "444444789 - Hello, world -           This is a string."
36int(5)
37string(56) "123456789 - Bonjour, world -           This is a string."
38string(42) "123456789. Hello, world. This is a string."
39string(30) "josmessa at uk dot ibm dot com"
40