Answers for "regex number"

regular expression number from 1 to 100

^[1-9][0-9]?$|^100$

regex match number

For matching an integer number of one single char/digit, specify:
[0-9]
But for matching any number of more than one char/digit; add "+":
[0-9]+
Example for matching hour with minutes of HH:MM format in a file:
grep "[0-9]+:[0-9]+" file.txt

regex all not numbers

echo 1a2b3c | sed 's/[^0-9]//g'	#Replaces all not numbers
abc

regex for numbers

Regex regex = new Regex(@"^d$");