regex101 quiz

If you find better and short solution pls let me know.

My Solution

1. Task 1
   Check if a string contains the word word in it (case insensitive). If you have no idea, I guess you could try /word/.

   Regular Expression

   \bword\b
   

   And enable the "i" flag

   Your shortest solution thus far is 11 characters long. The overall shortest solution is 11 characters long.

2. Task 2
   Use substitution to replace every occurrence of the word i with the word I (uppercase, I as in me). E.g.: i'm replacing it. am i not? -> I'm replacing it. am I not?. A regex match is replaced with the text in the Substitution field when using substitution.

   Regular Expression

   \bi\b

   Substitution

   I

   Your shortest solution thus far is 9 characters long. The overall shortest solution is 9 characters long.

3. Task 3
   With regex you can count the number of matches. Can you make it return the number of uppercase consonants (B,C,D,F,..,X,Y,Z) in a given string? E.g.: it should return 3 with the text ABcDeFO!. Note: Only ASCII. We consider Y to be a consonant! Example: the regex /./g will return 3 when run against the string abc.

   Regular Expression

   [^AEIOUa-z_\W\d]

   Your shortest solution thus far is 19 characters long. The overall shortest solution is 16 characters long.

4. Task 4
   Count the number of integers in a given string. Integers are, for example: 1, 2, 65, 2579, etc.

   Regular Expression

   \ d+

   Your shortest solution thus far is 6 characters long. The overall shortest solution is 6 characters long.

5. Task 5
   Find all occurrences of 4 or more whitespace characters in a row throughout the string. Regular Expression

   \s{4,}

   Your shortest solution thus far is 9 characters long. The overall shortest solution is 9 characters long.

6. Task 6
   Oh no! It seems my friends spilled beer all over my keyboard last night and my keys are super sticky now. Some of the time whennn I press a key, I get two duplicates. Can you ppplease help me fix thhhis?

   Regular Expression

   (.)\1\1

   Substitution

   $1

   Your shortest solution thus far is 12 characters long. The overall shortest solution is 12 characters long.

7. Task 7
   Validate an IPv4 address. The addresses are four numbered separated by three dots, and can only have a maximum value of 255 in either octet. Start by trying to validate 172.16.254.1.

   Regular Expression

   ^(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])(?:.(?!$)|$)){4}$

   Your shortest solution thus far is 77 characters long. The overall shortest solution is 40 characters long.

8. Task 8
   Strip all HTML tags from a string. HTML tags are enclosed in < and >. The regex will be applied on a line-by-line basis, meaning partial tags will need to be handled by the regex. Don't worry about opening or closing tags; we just want to get rid of them all. Note: This task is meant to be a learning exercise, and not necessarily the best way to parse HTML.

   Regular Expression

   ]*>|<[^<>]*>?

   Substitution

   Your shortest solution thus far is 23 characters long. The overall shortest solution is 14 characters long.