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This is string that I got

This given stirng

Immunodeficiency with increased immunoglobulin [M] [IgM] Maternal care for anti-D [Rh] antibodies, unspecified trimester

I tried to finding multiple occurrences of a string within a string in Python, and get their index.

so, with a input string

  char = random input string

I wanted result like this:

result = [[index, index, index],[index, index, index ]]

so, this is code that I used. 

            a = [m.start() for m in re.finditer(char,given string)]

,but it didn't work for metacharacters, and caused re.error: unterminated character set at position 0

how can I improve this code?

goldenasian
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1 Answers1

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If you want to use re.finditer() with a random input string, you need to escape it in case it contains characters that have special meaning in regular expressions.

regex = re.escape(char)
a = [m.start() for m in re.finditer(regex,given string)]
Barmar
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  • Thanks a lot, it solved my problem, but I used re.finditer(), because that's the only think that learned. Is there any better function for finding occurrences of a string? – goldenasian Apr 09 '20 at 22:04
  • Apparently not. See https://stackoverflow.com/questions/4664850/how-to-find-all-occurrences-of-a-substring – Barmar Apr 09 '20 at 22:06