/[B-DF-HJ-NP-TV-Z]/g

This is 20 total characters. quiz #3 says that the shortest solution is 16 characters, but I'm not sure if that is for the JavaScript flavor of regexes.

/[B-DF-HJ-NP-TV-Z]/g

This is 20 total characters. http://regex101.com/quiz/# quiz #3 says that the shortest solution is 16 characters, but I'm not sure if that is for the JavaScript flavor of regexes.

• javascript
• regex

• Your regex is already 16 characters. the slashes and g are not part of it. – aliteralmind Commented Mar 28, 2014 at 23:28
• For this particular website they are. – Keith Grout Commented Mar 28, 2014 at 23:30

4 Answers 4

16 char regex

(?![AEIOU])[A-Z]

this is Only ASCII, so this will the shortest regex, use Negated Character Classes, please see Negated Character Classes

[^ -AEIOU[-ÿ], 13 characters

/[^ -AEIOU[-ÿ]/g, with flag, 16 characters

You can get it a little bit shorter by using a \P{Lu} class:

[^\P{Lu}AEIOU]

[I'm not restricting this to Javascript because regex101 is primarily PCRE flavour]

The above has 14 characters. Since the puzzle also adds in characters from the word boundaries and flags, this adds 3 more characters for //g, hence total 17 characters.

In .NET, you can do it shorter:

[B-Z-[EIOU]]

(12 chars long)

For javascript:

(?![EIOU])[B-Z]

15 chars excluding delimiters and flag.

My regex is 17 characters in length! I am still one shorter!

(?=[A-Z])[^AEIOU]

Using lookahead it is first checking the next character is in between A-Z or not. Then its checking for a Non-Vowel character.