Replace words in a string - Ruby

Question

I have a string in Ruby   sentence    My name is Robert    How can I replace any one word in this sentence easily without using complex code or a loop

User · Answer

sentence sub   Robert    Joe    Won t cause an exception if the replaced word isn t in the sentence  the     variant will    How to replace all instances   The above replaces only the first instance of  Robert     To replace all instances use gsub gsub   ie   global substitution     sentence gsub   Robert    Joe    The above will replace all instances of Robert with Joe

User · Answer

First  you don t declare the type in Ruby  so you don t need the first string     To replace a word in string  you do  sentence gsub  match    replacement

User · Answer

If you re dealing with natural language text and need to replace a word  not just part of a string  you have to add a pinch of regular expressions to your gsub as a plain text substitution can lead to disastrous results    mislocated cat  vindicating  gsub  cat    dog     gt   mislodoged dog  vindidoging    Regular expressions have word boundaries  such as  b which matches start or end of a word  Thus    mislocated cat  vindicating  gsub   bcat b    dog     gt   mislocated dog  vindicating    In Ruby  unlike some other languages like Javascript  word boundaries are UTF-8-compatible  so you can use it for languages with non-Latin or extended Latin alphabets                               gsub   b     b              gt

User · Answer

You can try using this way    sentence   Robert      Roger    Then the sentence will become    sentence    My name is Roger    Robert is replaced with Roger

[ruby] Replace words in a string - Ruby

How to replace all instances?

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