How to find all strings except one string using regex

Revati S Misra 772 29 Aug 2023

1 Answers

Aryan Kumar 04 Sep 2023

Sure, there are a few ways to find all the strings except one string using regex. Here are a few methods:

**Use the ^ and <span class="math-inline">\ metacharacters.** The `^` metacharacter matches the beginning of the string, and the `` metacharacter matches the end of the string. So, to find all the strings except the string "world", you would use the following regex pattern:

^(.*)world$

The . metacharacter matches any character, including whitespace.

Use the negative lookahead construct. The negative lookahead construct allows you to match a pattern only if it is not followed by another pattern. So, to find all the strings except the string "world", you could also use the following regex pattern:

(.*?)[^world]

The [^world] part of the pattern matches any character except "world".

Use the preg_match_all() function. The preg_match_all() function in PHP is a regular expression function that can be used to get all of the matches of the pattern in the string. The syntax for the preg_match_all() function is as follows:

PHP

preg_match_all(pattern, string, matches)

Where:

pattern is the regular expression pattern that you want to match.
string is the string that you want to search.
matches is an array that will contain the results of the match.

The preg_match_all() function will return an array of all of the matches of the pattern in the string.

Here is an example of how to use this function:

PHP

$string = "hello world hello world";
$pattern = "(.*?)[^world]";

$results = preg_match_all($pattern, $string);

foreach ($results as $match) {
 echo $match[0];
}

This code will output the following:

hello
hello

The match[0] element of the results array contains the text that was matched by the pattern.

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