How Do I Make `preg_match` Case-Insensitive?

Making preg_match Case Insensitive

When using the preg_match function, case sensitivity can be a limiting factor in certain scenarios. Consider the following code:

preg_match("#(.{100}$keywords.{100})#", strip_tags($description), $matches);

This code attempts to display 100 characters on either side of the search string in the middle. However, it is case sensitive, potentially missing desired results.

Solution: Adding the 'i' Modifier

To make this code case insensitive, simply add the "i" modifier after the delimiter (# in this case):

preg_match("#(.{100}$keywords.{100})#i", strip_tags($description), $matches);

Alternatively, if the delimiter is "/" instead of "#", add the "i" after it:

preg_match("/your_regexp_here/i", $s, $matches);

With the "i" modifier, letters in the pattern will match both upper and lower case letters, ensuring that all relevant results are captured.

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