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How do you find specific shortcode from the WordPress page or post contents? For a example if you are using “gallery” shortcode, you want to check that code if exist or not for some modifications. I wanted this for gallery shortcode if exist for some gallery width changes.So I found some codes and I have improved php codes and implementing here to you.

Checks whether a specific shortcode exists or not

You can use wordpress core shortcode_exists() function to this.

 if ( shortcode_exists( 'gallery' ) ) {
      // gallery shortcode is exist

But here you can’t find shortcode is exist in the post/page contents.Here I’m going to explain how to check exists specific shortcode from page or post contents.
I’m using this code inside the post/page loop.

$pattern = get_shortcode_regex();
preg_match('/'.$pattern.'/s', $post->post_content, $matches);
if (is_array($matches) && $matches[2] == 'gallery') {
         // gallery shortcode is exist in the post contents

Further, after found that shortcode you want to access that with it’s parameters.

$pattern = get_shortcode_regex();
preg_match('/'.$pattern.'/s', $post->post_content, $matches);
if (is_array($matches) && $matches[2] == 'gallery') {
        $shortcode = $matches[0]; // get shortcode with it's parameters
	echo do_shortcode($shortcode); // execute that shortcode we've found

Additional Notes

This only detects the first shortcode in the post content, though.Because of the preg_match() function.
preg_match() returns the number of times pattern matches. That will be either 0 times (no match) or 1 time because preg_match() will stop searching after the first match. preg_match_all() on the contrary will continue until it reaches the end of subject.

preg_match_all('/'.$pattern.'/s', $post->post_content, $matches); // check all shortcode

Delete all shortcode tags from post contents

Simply use the strip_shortcodes() wordpess function to remove all tags.(html tags)

echo strip_shortcodes($post->post_content);