number pattern regex code example

Example 1: city regex pattern

^[a-zA-Z',.\s-]{1,25}$

Example 2: regex pattern for mobile number

/^(\+\d{1,3}[- ]?)?\d{10}$/

Example 3: 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

Example 4: regex for numbers

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