Top list item finder

This online program finds the top items in a list by counting how many times each item appears in it. The program prints the total count of the items as well as calculates the relative frequency of the items in percentage. There are three blocks of options that let you adjust various list parameters to make it easier for the program to identify the input list items, set the method for comparing the items, and specify how to display the most popular items. Now let's review each block of options more carefully. In the first block, you'll find the "Separate Items by a Character" option that tells the program that individual list items are separated by a specific character. It can be a comma, a comma followed by a space, a semicolon, or any other character or character combination. The program will then split the list into items via this option. The "Separate Items by a Regexp" option is for more complex use cases and it allows the program to extract list items via a regular expression that defines how the items are separated. A regexp provides more flexibility when working with complex list structures and patterns. For example, if the list items are separated by multiple different characters, then this option will be useful as you can specify a regexp such as "/[,;]/" to match all list items that are separated either by a comma or by a semicolon. In the "Input Separator" option, you can enter the separator character or the regular expression, depending on the selected item separation mode. In the second block, you'll find another three options. The "Remove Empty Items" option instructs the tool to ignore all empty items during the counting process. An item is considered to be empty if it has no characters or contains only spaces. The "Trim Top List Items" option removes leading and trailing spaces from each item so that the same item wasn't accidentally counted twice. The "Ignore Item Case" option converts all items to lowercase before analysis, so that variations in letter capitalization didn't affect the results. In the third block of options, there are two more options. The "Top Item Format" option allows you to change the display format of the most popular list items. You can choose one of three formats: display the item with the occurrence count, display the item with usage percentage, or display the item occurrence as a fraction of the total item count. Finally, the "Top Item Sorting" option determines the order in which the most popular items are printed to the screen. There are three sorting options you can choose from: sorting by count (in descending order – from the most popular item to the least popular), sorting alphabetically (in ascending order – from a to z), or don't sort anything at all, in which case item counts are presented in item occurrence order. Listabulous!