Python 特定字符之间的正则表达式捕获

Question

I'm struggling with some regex for a few parts of these strings below. This for use in a str.extract() and I need to capture:

• jump or crawl, this will follow two spaces
• valueA or valueB, this will follow the $
• amount between @ and \n, sometimes, but not always, this includes up to two decimals

⬆️  jump $valueA @ 5084\n\n#blah
⬆️  jump $valueB @ 628.15\n\n#blah
⬇️  crawl $valueB @ 626.8\n\n#blah
⬇️  crawl $valueB @ 4070\n\n#blah
⬆️  jump $valueA @ 6175.5\n\n#blah

Answer 1

You can use the pattern (jump|crawl)\s+\$(value[AB])\s@\s(\d*\.?\d*) :

df = pd.DataFrame({"value":["⬆️  jump $valueA @ 5084\n\n#blah",
                            "⬆️  jump $valueB @ 628.15\n\n#blah",
                            "⬇️  crawl $valueB @ 626.8\n\n#blah",
                            "⬇️  crawl $valueB @ 4070\n\n#blah",
                            "⬆️  jump $valueA @ 6175.5\n\n#blah"]})

print (df["value"].str.extract("(jump|crawl)\s+\$(value[AB])\s@\s(\d*\.?\d*)"))

       0       1       2
0   jump  valueA    5084
1   jump  valueB  628.15
2  crawl  valueB   626.8
3  crawl  valueB    4070
4   jump  valueA  6175.5