check if substring exists in main string per word

Question

I have a string I want to check if a substring is in the main string. The code I have below works partially. The problem is I want to check if the substring matches per word to the main string currently it checks per character. To Explain this better say my main string is the banana is yellow and if the substring I am looking for is banana is I want it to print true but if the substring is ana is it prints false. How can I achieve this?

const testString = 'the banana is yellow'
const checkString = 'ana is'

//should have printed false
if (testString.includes(checkString)) {
  console.log('true')
} else {
  console.log('false')
}

@Dai nope just edited!

seriously
– seriously

2022-07-19 03:00:25 +00:00
Commented Jul 19, 2022 at 3:00 — seriously
– seriously, Commented Jul 19, 2022 at 3:00

CertainPerformance · Accepted Answer · 2022-07-19 02:56:15Z

4

Turn the needle into a regular expression surrounded by word boundaries.

const testString = 'the banana is yellow'
const checkString = 'ana is'
const pattern = new RegExp('\\b' + checkString + '\\b');

console.log(pattern.test(testString));

If the needle might contain special characters, escape them before passing to the RegExp constructor.

answered Jul 19, 2022 at 2:56

CertainPerformance

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3 Comments

seriously Over a year ago

Why escape special characters? check string banana i*s would reply false.

Wyck Over a year ago

@seriously because you want all the characters of checkString to be matched literally, and not to be interpreted as any special regular expression syntax.

CertainPerformance Over a year ago

Escape the special characters if you would want that to be detected a match (and the special characters aren't on the edge of the needle)

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