# Special Identifier Action

[Special Identifier](/docs/reference/special-identifiers) actions allow you to create custom Special Identifiers with any set of supplied text, even using other [Special Identifiers](/docs/reference/special-identifiers). You can also perform special functions on the replacement text to alter it before it's saved:

- **tolower(*TEXT*)** = Converts all letters to their lower-case form
- **toupper(*TEXT*)** = Converts all letters to their upper-case form
- **removespaces(*TEXT*)** = Removes all spaces from the text
- **removecommas(*TEXT*)** = Removes all commas from the text
- **length(*TEXT*)** = Replaces with the total number of characters in the text
- **count(*TEXT*,*SEARCH*)** = Counts the number of times SEARCH is present in TEXT (EX: count(Count the number of e letters in this sentence,e) => 8)
- **replace(*TEXT*,*SEARCH*,*REPLACEMENT*)** = Replaces SEARCH with REPLACEMENT everywhere it's present in TEXT (EX: replace(Hello World,World,Universe) => Hello Universe)
- **urlencode(*TEXT*)** = URL encodes the text for use as part of URL paths (EX: "Hello World" => "Hello+World")
- **uriescape(*TEXT*)** = URI escapes the text for use as part of URL paths (EX: "Hello World" => "Hello%20World")
- **datefrom(date):** Calculates the time elapsed since a past date. Returns an error if the date hasn't occurred yet. (EX: `datefrom(2025-01-01)` )
- **dateto(date):** Calculates the time remaining until a future date. Returns an error if the date has already passed. (EX: `dateto(2026-12-25)`)

> Note: Both dateto() and datefrom() functions support including a time alongside the date (EX: 2026-12-25 14:30:00 or 2026-12-25 2:30 PM). Accepted date formats may vary based on your PC's regional/culture settings (EX: MM/DD/YYYY for US, DD/MM/YYYY for UK).

By default, custom [Special Identifiers](/docs/reference/special-identifiers) will only work within the command they were created in and will cease to exist after the command is finished. If you wish to access a [Special Identifier](/docs/reference/special-identifiers) after a command is finished, you can enable the **Make Globally Usable** option. This will persist the [Special Identifier](/docs/reference/special-identifiers) for as long as Mix It Up is running. When using this option, it is **VERY IMPORTANT** to be careful what you name this custom Special Identifier, as you can prevent other [Special Identifiers](/docs/reference/special-identifiers) from working. For example, if you make a custom [Special Identifier](/docs/reference/special-identifiers) called $user, this would prevent all [User Special Identifiers](/docs/reference/special-identifiers#user) from working correctly such as $username.

You can also use this action to run math computations & store the result in a Special Identifier by toggling the **Is Math Expression** option. Simply type in an equation, which can contain other Special Identifiers, and include the appropriate math symbols (EX: +, -, *, /). You can also use special functions in here to perform operations, such as finding the minimum of two numbers. The full list of supported functions can be found here: https://github.com/pieterderycke/Jace/wiki