How to check a string and replace the space into "_" ?
let str = "hello @%123abc456:nokibul amin mezba jomadder% @%123abc456:nokibul% @%123abc456:nokibul amin mezba%"
str = str.replace(regex, 'something');
console.log(str);
// Output: str = "hello @%123abc456:nokibul_amin_mezba_jomadder% @%123abc456:nokibul% @%123abc456:nokibul_amin_mezba%"
Please help me out :)
Check this out. I think it's gonna help
Hints:
/:(\w+\s*)+/g Separates the :nokibul amin mezba jomadder as a group.{0}, {1} ... {n}.:nokibul amin mezba jomadder to :nokibul_amin_mezba_jomadder.{index} with groups.let str = "hello @%123abc456:nokibul amin mezba jomadder% @%123abc456:nokibul% @%123abc456:nokibul amin mezba%";
/* Extracting Groups */
let groups = str.match(/:(\w+\s*)+/g);
/* Formatting Groups: Replacing Whitespaces with _ */
let userTags = groups.map((tag, index) => {
/* Index wise string templating */
str = str.replace(tag, `{${index}}`)
return tag.replace(/\s+/g, "_");
});
console.log(str);
console.log(userTags);
/* Replacing string templates with group values */
userTags.forEach((tag, index) => str = str.replace(`{${index}}`, tag));
console.log(str);Hint: You can use https://regex101.com/ to test whether a regex works, it supports substitution as well.
Regex being used: (\w+)[ ], to grep all words between space, and use $1_ to substitute the space to underscore.
const regex = /(\w+)[ ]/gm;
const str = `Input: str="nokibul" output: str="nokibul"
Input: str="nokibul amin" Output: str="nokibul_amin"
Input: str="nokibul amin mezba" Output: str="nokibul_amin_mezba"
Input: str="nokibul amin mezba jomadder" Output: str="nokibul_amin_mezba_jomadder"`;
const subst = `$1_`;
// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);
console.log('Substitution result: ', result);
Simple one liner
str.replace(/:[^%]*%/g, arg => arg.replace(/ /g, '_'))
Explanation:
/:[^%]*%/g Find all occurrences starting with : and ending at %
This will return patterns like this :nokibul amin mezba jomadder% :nokibul% :nokibul amin mezba%
Next is to replace all space characters with underscores using this replace(/ /g, '_')
