Using str.startswith is a cool idea in this case. But is it better than regex
for performance or reliability? Regex syntax is not a model of simplicity, but
in my simple case it's not too difficult.
Feb 27, 2023, 18:52 by li...@tompassin.net:
> On 2/27/2023 9:16 PM, avi.e.gr...@gmail.com wrote:
>
>> And, just for fun, since there is nothing wrong with your code, this minor
>> change is terser:
>>
>>>>> example = 'X - abc_degree + 1 + qq + abc_degree + 1'
>>>>> for match in re.finditer(re.escape('abc_degree + 1') , example):
>>>>>
>> ... print(match.start(), match.end())
>> ...
>> ...
>> 4 18
>> 26 40
>>
>
> Just for more fun :) -
>
> Without knowing how general your expressions will be, I think the following
> version is very readable, certainly more readable than regexes:
>
> example = 'X - abc_degree + 1 + qq + abc_degree + 1'
> KEY = 'abc_degree + 1'
>
> for i in range(len(example)):
> if example[i:].startswith(KEY):
> print(i, i + len(KEY))
> # prints:
> 4 18
> 26 40
>
> If you may have variable numbers of spaces around the symbols, OTOH, the
> whole situation changes and then regexes would almost certainly be the best
> approach. But the regular expression strings would become harder to read.
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