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# Character Classification and Conversion Functions

Character Classification and Conversion functions allow you to convert characters within a string. Expand the category to view a list of the available functions.

Click one of the following functions for more information:

Function Name | Description
tolower | Converts a character to lowercase.
toupper | Converts a character to uppercase.
isdigit | Checks if a string is a decimal digit.
isalpha | Checks if a string is a letter.

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