Drupal 7, field view alter.

gistfile1.txt

/**
 * Implements hook_field_attach_view_alter().
 */
function MODULE_field_attach_view_alter(&$output, $context) {
  foreach (element_children($output) as $field_name) {
    if ($field_name == 'field_cmrc_price_table') {

      // If min and max price have the same value, then display price without range.
      if (isset($output['field_cmrc_price_table'][0]['#markup']) && !empty($output['field_cmrc_price_table'][0]['#markup'])) {
        $separated_price = explode('–', $output['field_cmrc_price_table'][0]['#markup']);

        if (count($separated_price) == 2) {
          $min_price = gm_wizard_get_number_from_string($separated_price[0]);
          $max_price = gm_wizard_get_number_from_string($separated_price[1]);
          $prices_corrects = (is_numeric($min_price) && is_numeric($max_price));
          $prices_are_equal = ($min_price == $max_price);

          if ($prices_corrects && $prices_are_equal) {
            $output['field_cmrc_price_table'][0]['#markup'] = trim($separated_price[0]);
          }
        }
      }
    }
  }
}

/**
 * Get number from string.
 *
 * @param string $string
 * @return int|float|NULL $number
 */
function gm_wizard_get_number_from_string($string) {
  $number = NULL;
  preg_match_all('#\d+\.*\d*#',  $string, $match);

  if (isset($match[0][0]) && is_numeric($match[0][0])) {
    $number = $match[0][0];
  }

  return $number;
}