Search for word in a phrase and return match

Question

I need to build a formula that:

If in column X, has the values ​​of column B (regardless of position), returns the values ​​of A

Column A
Amoxicilina
Azitromicina
Cetoconazol

Column B
Amoxicilina
Esomeprazol + Claritromicina + Amoxicilina
Amoxicilina + Clavulanato de potássio
Azitromicina
Cetoconazol
Betametasona + Sulfato de Neomicina + Cetoconazol
Cetoconazol + Betametasona

the result I want is like this:

Column B	Column A
Amoxicilina	Amoxicilina
Esomeprazol + Claritromicina + Amoxicilina	Amoxicilina
Amoxicilina + Clavulanato de potássio	Amoxicilina
Azitromicina	Azitromicina
Cetoconazol	Cetoconazol
Betametasona + Sulfato de Neomicina + Cetoconazol	Cetoconazol
Cetoconazol + Betametasona	Cetoconazol

Answer 1

use:

=ARRAYFORMULA(IFNA(REGEXEXTRACT(B1:B, TEXTJOIN("|", 1, A1:A))))

Answer 2

I used this method (though I am a little unclear of your exact requirement - is it the corresponding column A, or if the thing is contained, return it if it's in column A as well?):

=IF(REGEXMATCH(C2,"(?i)"&B2),A2,"No Match")

The "?i" in the regular expression is to make it case insensitive when searching as shown in the last line.