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What is the regex to match words that have the pattern:
Number or Capital in any order * 3 (+possible 'List' on the end)
For example,
OP3 G6H ZZAList 349 127List are all valid, whereas
a3G P-0List HYiList def YHr are all invalid.
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Using character sets For example, the regular expression "[ A-Za-z] " specifies to match any single uppercase or lowercase letter. In the character set, a hyphen indicates a range of characters, for example [A-Z] will match any one capital letter.
It indicates that the subpattern is a non-capture subpattern. That means whatever is matched in (?:\w+\s) , even though it's enclosed by () it won't appear in the list of matches, only (\w+) will.
The regex [0-9] matches single-digit numbers 0 to 9. [1-9][0-9] matches double-digit numbers 10 to 99. That's the easy part. Matching the three-digit numbers is a little more complicated, since we need to exclude numbers 256 through 999.
You can use the regex:
^[A-Z0-9]{3}(?:List)?$ Explanation:
^ : Start anchor [A-Z0-9] : Char class to match any one of the uppercase letter or digit {3} : Quantifier for previous sub-regex (?:List) : A literal 'List' enclosed in non-capturing paranthesis ? : To make the 'List' optional $ : End anchor See it
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