How to replace text with regular expressions in Ruby?

Question

ruby

There is a text line in which a preposition occurs, myI need to replace this preposition with in the whole sentence me, but if, for example, such a sequence of letters occurs in a word, then nothing needs to be changed inside the word, only an independent preposition, how can this be done?

Answer 1

str.gsub(/\bmy\b/, 'me')