Question

I have a set of words in an array and i would like to get only the ones that match the regexp i apply to.

Let’s say I have the following set of words:

friend
fired
fried
afternoon
affiliate
activate
staff
neafe

and i need to apply a regexp that accomplish the following rules:

1.- One regexp that get only words that starts with ‘f’.
2.- One regexp that get only words that ends with ‘f’.
3.- One regexp that get only words that contains ‘f’.
4.- One regexp that get only words that has one letter before ‘f’.
5.- One regexp that get only words that has one letter after ‘f’.

so, results for every case would be:

case 1
friend
fired
fried

case 2
staff

case 3
friend
fired
fried
afternoon
affiliate
staff
neafe

case 4
afternoon
affiliate

case 5
staff
neafe

Need help please.

Answer 1

They will all match only if the word fits the criteria you described for each case:

1. ^f.*
2. .*f$
3. f
4. ^.f
5. f.$

of course the input of each pattern MUST be a single word