WordPress shortcode in content, output in sidebar?

If you wanna show the content in sidebar if current post content has the shortcode then you should try has_shortcode function. Here is a demonstration-

$content = get_the_content();
if( has_shortcode( $content, 'your-shortcode' ) ) {
    // The content has a [your-shortcode] short code, so this check returned true.
}

Hope it helps.

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