Q:

PHP program to demonstrate the regular expression to replace the substring within the string

belongs to collection: PHP Regular Expressions Programs

mahmoud2506
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2022-05-26
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In this program, we will demonstrate the regular expression to replace a specified substring within the string using the preg_replace() function.

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mahmoud2506
2022-05-26
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Program/Source Code:

The source code to demonstrate the regular expression to replace the substring within the string is given below. The given program is compiled and executed successfully.

<?php
//PHP program to demonstrate the regular expression 
//to replace the substring within the string.

$str = "Welcome to India";
$pattern = "/india/i";

$str1 = preg_replace($pattern, "USA", $str);

print ($str1);
?>

Output:

Welcome to USA

Explanation:

In the above program, we created a string variable $str, which is initialized with "Welcome to India". After that, we used 'i' in the pattern to search case insensitive substring in the specified string. Here, we used the preg_replace() function to replace the substring within the string and return the updated string that will be assigned to the variable $str1 and printed on the webpage using the print() function.

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