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In "More Metacharacters", third explanation page, what is that "(-)" doing there?
In "More Metacharacters", third explanation page, what is that "(-)" doing there? The specific lesson is about the question mark metacharacter, but there's a "(-)" in the string that really got me confused. The metacharacter ? means "zero or one repetitions". Example: import re pattern = r"ice(-)?cream" if re.match(pattern, "ice-cream"): print("Match 1") if re.match(pattern, "icecream"): print("Match 2") if re.match(pattern, "sausages"): print("Match 3") if re.match(pattern, "ice--ice"): print("Match 4")
2 Antworten
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"Causes the resulting RE to match 0 or 1 repetitions of the preceding RE. ab? will match either 'a' or 'ab'."
https://docs.python.org/3/library/re.html#index-5
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Thanks, Diego!
And here is an online RegEx tester that I found very useful: https://regex101.com/
All the best!