Locate a string containing a series of words separated by a character, with the last word being able to end with any combination of characters through the use of regex

Here are some words to consider:

const words = ["apple", "orange", "tomato"]

const str = "apple.orange.tomato.$COULD_$_BE_ANY_STRING_HERE"

I am in search of a regular expression to verify the format of this string.

  • The string cannot finish with "."
  • It must include at least one instance of "."
  • The final part of the string needs to accommodate the "$" character

I've tested various patterns, such as 

^((apple|orange|tomato)(\\.|$))*$
, but it seems to permit the string ending with "." and lacking a "."

javascriptregex

Answer №1

To create a regex pattern that matches one of the words apple, orange, or tomato followed by a dot, you can use: ^((apple|orange|tomato)\.)+?. It also allows for optional letters or underscores with \w*?, and ensures it does not end with a dot using [^\.\]$

^((apple|orange|tomato)\.)+?\w*?[^\.\]$

TEST

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