Examples :
Input: 28 Output: digit Input: a Output: not a digit. Input: 21ab Output: not a digit.
Code # 1: Using Python Regular Expressions
re.search (): This method either returns None (if the pattern does not match), or re.MatchObject, which contains information about the corresponding part of the string. This method stops after the first match, so it’s better for checking regular expressions than for extracting data.
| # Python program for identifying a digit
# import re module
# re module provides support
# for regular expressions import re
# Make a regular expression
# to identify a digit regex = ’^ [0-9] + $’
# Define a function for
# digit identification def check (string): # pass regex # and a line in the search () method if (re.search (regex, string)): print ( "Digit" ) else : prin t ( "Not a Digit" )
Driver code if __ name__ = = ’__main__’ : # Enter a string string = " 28 " # call the run function check (string) string = "a" check (string) string = "21ab" check (string) string = "12ab12" check (string) |
Exit :
Digit Not a Digit Not a Digit Not a Digit
Code # 2: Using the string.isnumeric ()
| # Python code to check is whether the string is numeric or not
# checking numeric characters string = ’123ayu456’ print (string.isnumeric ()) string = ’ 123456’ print (string.isnumeric ()) |
Exit:
False True
