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This FAQ applies to someone looking for special characters in a text. For example: numbers, capitals, accented characters, etc.
There is not a built-in function in AppleScript, so you should use any regexp tool (scripting addition or "do shell script" call) or ellaborate your own method depending on your needs.
In this quick example, we will delete all found numbers in a text:
stripNumbers("I'm the number 1.") --> "I'm the number ."
set theNumbers to "0123456789"
set prevTids to AppleScript's text item delimiters
repeat with i in theNumbers
set AppleScript's text item delimiters to i
set inputText to inputText's text items
set AppleScript's text item delimiters to prevTids
set inputText to inputText as text