Letter Match
import re
contents = [
"AB23",
"A2B3",
"DE09",
"MN90",
"XYi9",
"XY90"
]
for content in contents:
regex_pattern = "(?:AB|DE|XY)\d+"
# starts with AB or DE; should contain one or more number
m = re.match(regex_pattern, content)
if(m):
print('matched : '+content)
matched : AB23
matched : DE09
matched : XY90