R - count matches between characters of one string and another, no replacement

Question

I have a keyword (e.g. \'green\') and some text (\"I do not like them Sam I Am!\").

I\'d like to see how many of the characters in the keyword (\'g\', \'r\',

Answer 1

Perhaps you are looking to find the UNIQUE components of your keyword? Try:

keyword <- unique(strsplit('greeen','')[[1]])