Menu
You can use the | operator (logical OR) to match characters or expression of either the left or right of the | operator. For example the (t|T) will match either t or T from the input string.
$ : Indicates the end of line. abc$ would only match the string abc at the end of the line. This would not match any 'abc' in between the lines. * : Matches the last symbol preceding the '*' 0 or more times.
'?' is also a quantifier. Is short for {0,1}. It means "Match zero or one of the group preceding this question mark." It can also be interpreted as the part preceding the question mark is optional. e.g.: pattern = re.compile(r'(\d{2}-)?\
I'm going to assume you want to build a the regex dynamically to contain other words than part1 and part2, and that you want order not to matter. If so you can use something like this:
((^|, )(part1|part2|part3))+$
Positive matches:
part1
part2, part1
part1, part2, part3
Negative matches:
part1, //with and without trailing spaces.
part3, part2,
otherpart1
'^(part1|part2|part1,part2)$'
does it work?
Does this work without alternation?
^((part)1(, \22)?)?(part2)?$
or why not this?
^((part)1(, (\22))?)?(\4)?$
The first works for all conditions the second for all but part2(using GNU sed 4.1.5)
Not an expert in regex, but you can do ^((part1|part2)|(part1, part2))$. In words: "part 1 or part2 or both"
Or you can use this:
^(?:part[12]|(part)1,\12)$
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With