Remove trailing pipe from single post meta in Divi child theme by modifing et_postinfo_meta in functions.php

et_postinfo_meta.php

<?php

//* Modify post meta to get rid of trailing pipe
function et_postinfo_meta( $postinfo, $date_format, $comment_zero, $comment_one, $comment_more ){

	global $themename;
	$postinfo_meta = '';

	if ( in_array( 'author', $postinfo ) )
		$postinfo_meta .= ' ' . esc_html__('by',$themename) . ' ' . et_get_the_author_posts_link() . ' | ';

	if ( in_array( 'date', $postinfo ) )
		$postinfo_meta .= get_the_time( $date_format ) . ' | ';

	if ( in_array( 'categories', $postinfo ) )
		$postinfo_meta .= get_the_category_list(', ')  . ' | ';

	if ( in_array( 'comments', $postinfo ) )
		$postinfo_meta .= et_get_comments_popup_link( $comment_zero, $comment_one, $comment_more );

  $trailingpipecheck = substr($postinfo_meta, strlen($postinfo_meta)-3, strlen($postinfo_meta));  
  if ( $trailingpipecheck == ' | ' )
    $postinfo_meta = substr($postinfo_meta, 0, strlen($postinfo_meta)-3);
    
	echo $postinfo_meta;

}