## Summary

Regular expressions can be used to match numbers in a range, such as 0 to 9, 1 to 9, 0 to 10, 1 to 10, 1 to 12, 1 to 16, 1-31, 1-32, 0-99, 0-100, 1-100, 1-127, 0-255, 0-999, 1-999, 1-1000 and 1-9999.
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To match all characters from 0 to 255, a regex that matches between one and three characters is needed, such as
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for single-digit numbers 0 to 9 and
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2
3
1
2
for double-digit numbers 10 to 99.
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Regular expressions can also be used to match numbers that divide by other numbers, or numbers that don't have a pattern.
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## Summaries from the best pages on the web

Summary
The Regex number range include matching 0 to 9, 1 to 9, 0 to 10, 1 to 10, 1 to 12, 1 to 16 and 1-31, 1-32, 0-99, 0-100, 1-100,1-127, 0-255, 0-999, 1-999, 1-1000 and 1-9999.

Regex for Numbers and Number Range (With Examples) - Regex Tutorial - Regular Expressions Simplified
regextutorial.org

The fundamental building blocks of a regex are patterns that match a single character. Most characters, including all letters ( a-z and A-Z ) and digits ( 0-9 ...

Regular Expression (Regex) Tutorial
ntu.edu.sg

Summary
To match all characters from 0 to 255, we’ll need a regex that matches between one and three characters.
The regex [ 0-9 ] matches single-digit numbers 0 to 9. [ 1-9 ] [ 0-9 ] matches double-digit numbers 10 to 99. That’s the easy part.

Example: Matching Numeric Ranges with a Regular Expression
regular-expressions.info

In a regular expression, shorthand character classes match a single character from a ... whitespace or a digit. When applied to 1 + 2 = 3 , the former regex ...

Regexp Tutorial - Shorthand Character Classes
regular-expressions.info

Summary
Regular Expressions are a type of expression that can be used to match various numbers, such as numbers that divide by other numbers, or numbers that don't have a pattern. Examples of regular expressions are provided, as well as tips on how to use them to match numbers in a range of numbers, such as the 40s, 60s, and 80s, or those that divide by 2,4,5,10 etc.

Regular Expressions Tutorial => Matching various numbers
riptutorial.com

Then a regexp \d{3,} looks for sequences of digits of length 3 or more: alert( "I'm not 12, but 345678 years old".match(/\d{3,}/) ); // "345678"

Quantifiers +, *, ? and {n}
javascript.info

Includes tables showing syntax, examples and matches. ... Regex Accelerated Course and Cheat Sheet

Regex Cheat Sheet
rexegg.com

Like strings, regexps use the backslash, \ , to escape special behaviour. So to match an . , you need the regexp \. . Unfortunately this creates a problem. We ...

Regular expressions
r-project.org