Regular expression to extract any 4 digit number starting beginning with 5 from a text file using python

senheisen Published at Dev

36

senheisen

I am using the follwoing to extract any 4 digit number starting beginning with 5 from a text file using python:

regex = re.compile("^5\d{3}")

and this apparently looks only at the beginning of a line and doesn't look further until the end of the line to find the matches.

So for a sample string of "At this period by adding 52000 more particles we reched the value of 5810 threads per molecule." it shows no match.

What is wrong with my regular expression?

senheisen

regex = re.compile(r"\b(5\d{3})\b") is more exact

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edited at2021-05-23

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