检查每个单词的主字符串中是否存在子字符串

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') }

Answer 1

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.