'#description'=>$this->t("Enter one match per line in the format <code>search|replacement</code>, though the separator can be changed below.\nThe replacements will be processed in order provided above."),
'#required'=>TRUE,
];
$form[self::SETTING_SEPARATOR]=[
'#type'=>'textfield',
'#title'=>$this->t('Search/replacement value separator'),
'#description'=>$this->t('Control the character used to separate the "search" from the "replace" string in the field above. Defaults to "|", to match the value separator used on the Drupal core list fields.'),
'#description'=>$this->t('If checked, then the whole word or phrase will be matched, e.g. "book" will match "book" but not "the book". If this option is selected then "Respect word boundaries" above will be ignored.'),
$error_message=$this->formatPlural($amount,'Line @line is missing the separator "@separator".','Lines @lines and @last_line are missing the separator "@separator".',[