Question

How to extract only words with first-letter lowercase from a string in Node.js

Answer 1

function extract_only_words_with_first_letter_lowercase(s) {
    let words = s.split(' ');
    let lowercase = []; 
  
    words.forEach(function(word) {
        let character = word[0];
        if (character == character.toLowerCase()) {
            lowercase.push(word);
        }
    });
      
    return lowercase;
}
  
const s = "Node.js Is a cross-platform, Ppen-source JavaScript runtime environment";
  
const words = extract_only_words_with_first_letter_lowercase(s);
  
for (const w of words) {
    console.log(w);
}
  
  
  
  
/*
run:
  
a
cross-platform,
runtime
environment
  
*/

 

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Answer 2

function extract_only_words_with_first_letter_lowercase(s) {
     return s.split(/\s+/) .filter(word => /^[a-z]/.test(word));
}
  
const s = "PHP rust JavaScript c C++ Typescript python";
   
const lowercase = extract_only_words_with_first_letter_lowercase(s);
   
console.log(lowercase);



/*
run:

[ 'rust', 'c', 'python' ]

*/

 

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Answer 3

function extract_only_words_with_first_letter_lowercase(s) {
     return s.match(/\b[a-z]\w*/g) || [];
}
  
const s = "PHP rust JavaScript c C++ Typescript python";
   
const lowercase = extract_only_words_with_first_letter_lowercase(s);
   
console.log(lowercase);



/*
run:

[ 'rust', 'c', 'python' ]

*/

 

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