Use str_replace when a regex is unnecessary

Docs > コード分析 > Static Analysis Rules > Use str_replace when a regex is unnecessary

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Metadata

ID: php-best-practices/unnecessary-preg-replace

Language: PHP

Severity: Warning

Category: Best Practices

Description

The rule emphasizes the use of str_replace over preg_replace when regular expressions are not necessary. This is important because str_replace is faster and consumes less memory than preg_replace, making your PHP code more efficient.

Using regular expressions when they are not necessary can lead to slow performance and increased memory usage. It can also make your code harder to understand since regular expressions can be quite complex.

To avoid violating this rule, always use str_replace when you’re simply replacing one string with another. Only use preg_replace when you need to match a pattern, not a specific string. By following this rule, you can improve the performance of your PHP code and make it easier for other developers to understand.

Non-Compliant Code Examples

<?php
$str = "The document is ready for revew.";
$changed = preg_replace("/revew/", "review", $str);
$changed = preg_replace("/\./", "!", $changed);

Compliant Code Examples

<?php
$str = "The document is ready for revew.";
$changed = str_replace("revew", "review", $str);
$changed = str_replace(".", "!", $changed);

$str = "The document is ready for  revew...";
$changed = preg_replace("/\s*revew/", " review", $str);
$changed = preg_replace("/\.{3}/", "!", $changed);