Regular expressions, often shortened to regex, are a powerful tool for pattern matching in text. They are used in many programming languages and tools, including Python, JavaScript, and PHP. One common task is to determine if a string consists only of numeric characters. This is where the isnumeric function comes in.
What is isnumeric?
The isnumeric function is a method that checks if all characters in a string are numeric. It returns True if all characters are numeric, and False otherwise.
How does it work?
The isnumeric function uses a regex pattern to identify numeric characters. It checks for digits (0-9) as well as Unicode characters that represent numeric values, such as Roman numerals or fractions.
Example:
Let's look at some code examples:
import re
string1 = "12345"
string2 = "abc123"
string3 = "12.34"
if re.match(r'^\d+