How is the AND/OR operator represented as in Regular Expressions?
RegexOperatorsRegex Problem Overview
I'm currently programming a vocabulary algorithm that checks if a user has typed in the word correctly. I have the following situation: The correct solution for the word would be "part1, part2". The user should be able to enter either "part1" (answer 1), "part2" (answer 2) or "part1, part2" (answer 3). I now try to match the string given by the user with the following, automatically created, regex expression:
^(part1|part2)$
This only returns answer 1 and 2 as correct while answer 3 would be wrong. I'm now wondering whether there's an operator similar to | that says and/or instead of either...or.
May anyone help me solve this problem?
Regex Solutions
Solution 1 - Regex
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
Solution 2 - Regex
'^(part1|part2|part1,part2)$'
does it work?
Solution 3 - Regex
Not an expert in regex, but you can do ^((part1|part2)|(part1, part2))$. In words: "part 1 or part2 or both"
Solution 4 - Regex
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)
Solution 5 - Regex
Or you can use this:
^(?:part[12]|(part)1,\12)$
Solution 6 - Regex
use
if in vim:
:s/{\|}/"/g
will replace { and } on " so {lol} becomes "lol"