import re
REPLACEMENTS = dict([('max.' , ' maximum '),
                     ('inkl.' , ' inklusive '),
                     ('z.b.' , ' zum beispiel '),
                     ('ggf.', ' gegebenfalls '),
                     ('ca.' , ' circa ')])
 
sample_input_text = "Hallo, ggf ggf. max z.b. alpha z.b beta ca. 25 cm ca inkl. inkl. inkl"
joined = r'\b(?:' + '|'.join(map(re.escape, REPLACEMENTS.keys())) + r')(?!\B\w)'
print(re.findall(joined, sample_input_text))
# >> ['ggf ', 'ggf.', 'max ', 'z.b.', 'z.b ', 'inkl.', 'inkl.']
pattern = re.compile(joined)
output_text = pattern.sub(lambda m: REPLACEMENTS.get(m.group()), sample_input_text)
print(output_text)
# >> 'Hallo,  gegebenfalls  zum beispiel  alpha beta ca. 25 cm ca  inklusive   inklusive  inkl'
# "Hallo, ggf  gegebenfalls max zum beispiel alpha z.b beta circa 25 cm ca inklusive inklusive inkl"`

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