- // default grouping is at thousands, use the same for ###,###,### pattern too.
+ // Default grouping is at thousands, use the same for ###,###,### pattern too.
+ // In some languages it's conventional not to insert a thousands separator
+ // in numbers that are four digits long (1000-9999).
+ if ( $minimumGroupingDigits ) {
+ // Number of '#' characters after last comma in the grouping pattern.
+ // The pattern is hardcoded here, but this would vary for different patterns.
+ $primaryGroupingSize = 3;
+ // Maximum length of a number to suppress digit grouping for.
+ $maximumLength = $minimumGroupingDigits + $primaryGroupingSize - 1;
+ if ( preg_match( '/^\-?\d{1,' . $maximumLength . '}(\.\d+)?$/', $number ) ) {
+ return $number;
+ }
+ }