"Regular expressions are used to find sub-strings that match a specified pattern. In NeoLoad, they enable the definition of character strings for extraction (see Variable Extractor) or rules for validating text (see Assertion). ..."

"In computing, regular expressions, also referred to as regex or regexp, provide a concise and flexible means for matching strings of text, such as particular characters, words, or patterns of characters. ..."

"A formal syntactic specification widely implemented in the Unix language family for reference to strings..."

I agree it can be used for fp numbers (as you pointed out). But what you are describing is a range. I'd appreciate if you didn't keep having a hissy fit like a little bitch and actually talk for once.