Python regex | Check whether the input is Floating point number or not

Prerequisite: Regular expression in Python

Given an input, write a Python program to check whether the given Input is Floating point number or not.

Examples:

Input:  1.20
Output: Floating point number

Input: -2.356
Output: Floating point number

Input: 0.2
Output: Floating point number

Input: -3
Output: Not a Floating point number

In this program, we are using search() method of re module.

re.search() : This method either returns None (if the pattern doesn’t match), or re.MatchObject that contains information about the matching part of the string. This method stops after the first match, so this is best suited for testing a regular expression more than extracting data.

Let’s see the Python program for this :

# Python program to check input is 
# Floating point number or not 
  
# import re module 
  
# re module provides support 
# for regular expressions 
import re 
  
# Make a regular expression for 
# identifying Floating point number  
regex = '[+-]?[0-9]+\.[0-9]+'
  
# Define a function to 
# check Floating point number  
def check(floatnum):  
  
     # pass the regular expression 
     # and the string in search() method 
    if(re.search(regex, floatnum)):  
        print("Floating point number")  
          
    else:  
        print("Not a Floating point number")  
      
  
# Driver Code  
if __name__ == '__main__' :  
      
    # Enter the floating point number 
    floatnum = "1.20"
      
    # calling run function  
    check(floatnum) 
  
    floatnum = "-2.356"
    check(floatnum) 
  
    floatnum = "0.2"
    check(floatnum) 
  
    floatnum = "-3"
    check(floatnum) 

Output:

Floating point number
Floating point number
Floating point number
Not a Floating point number

My Personal Notes

Aug	SEP	Oct
	28
2019	2020	2021

Recommended Posts: