Regular Expressions Development Tutorials, Guides & Insights

import re

# Pattern to match integers with optional sign
pattern = r"[+-]?\d+"

# Example text containing integers
text = "The numbers are +42, -17, and 100."

matches = re.findall(pattern, text)
print(matches)  # Output: ['+42', '-17', '100']

• The pattern r"[+-]?\d+" matches both positive and negative integers (+42 and -17), as well as unsigned integers (100).

match = re.search(r'\d+', 'The price is 100 dollars')
if match:
    print(match.group())  # Output: 100

match = re.match(r'\d+', '123 apples')
if match:
    print(match.group())  # Output: 123

match = re.fullmatch(r'\d+', '12345')
if match:
    print(match.group())  # Output: 12345

matches = re.findall(r'\d+', 'There are 12 apples and 5 oranges')
print(matches)  # Output: ['12', '5']

matches = re.finditer(r'\d+', 'There are 12 apples and 5 oranges')
for match in matches:
    print(match.group())  # Output: 12 5

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