Question

How to extract only words with first-letter lowercase from a string in JavaScript

Answer 1

function extract_only_words_with_first_letter_lowercase(s) {
     words = s.split(' ');
  
     for (let i = 0; i < words.length; i++) {
          let letters = words[i].split('');
          if (letters[0] !== letters[0].toLowerCase()) {
              words.splice(i, 1); // remove the uppercase
          }
     }

     return words.join(' ');
}
 
 
const s = "JavaScript css Java pHp Html node.js";
  
const lowercase = extract_only_words_with_first_letter_lowercase(s);
  
console.log(lowercase);
  
  
  
/*
  
run:
  
css pHp node.js
  
*/

 

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Answer 2

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 = "JavaScript is A pPogramming language And core technology of The World Wide Web";
 
const words = extract_only_words_with_first_letter_lowercase(s);
 
for (const w of words) {
    console.log(w);
}
 
 
 
/*
run:
 
is
pPogramming
language
core
technology
of
 
*/

 

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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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Answer 4

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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