Regex

Question 1

Regex - any digit / any non digit

Answer 1

Any digit - \d

Any no digit - \D

Question 2

Regex - any character

Answer 2

Any character - .

Question 3

Regex - only certain character / only not certain character

Answer 3

Only - [those character / a-z for short form from A to Z]

Not - [^ those character]

Question 4

Regex - any alphanumeric character / not

Answer 4

Any - \w

Not - \W

Question 5

Regex - repetition of n

Answer 5

Ans - n{x, y} / n {x}

N repeats from x to y times
N repeats x times

Question 6

Regex - zero or more repetition / one or more repetition

Answer 6

Zero - *

One - +

Question 7

Regex - special characters (need to add )

Answer 7

.*+^?$()[]{}|\

Question 8

Regex - any white space / any not white space

Answer 8

Any - \s

Not - \S

Question 9

Regex - starting at / ending with

Answer 9

Start - ^ (put in front of the regex)
eg: ^abc -> string start with abc will be recognised
End - $ (put in the end of the regex)
eg: abc$ -> string end with abc will be recognised

Question 10

Regex - matching two possibilities

Answer 10

(abc|def)