Python

import re

test_string = 'a1b2cdefg'

matched = re.match("[a-z][0-9][a-z][0-9]+", test_string)
is_match = bool(matched)

print(is_match)

import re
regExPattern = re.compile("[0-9]")
input1 = "5"
if not re.fullmatch(regExPattern, input1):
    print("input is not a single digit")

# Example from https://docs.python.org/3/howto/regex.html
import re
p = re.compile('ab*')
p.match(input1)

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