Python

>>> re.search('d+|$', 'aa33bbb44').group()
'33'
>>> re.search('d+|$', 'aazzzbbb').group()
''
>>> re.search('d+|$', '').group()
''

>>> re.findall('d+|$', 'aa33bbb44')[0]
'33'
>>> re.findall('d+|$', 'aazzzbbb')[0]
''
>>> re.findall('d+|$', '')[0]
''

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