First letter using RegEx of string in JavaScript

Question

I have a string of full name.
From string to the first letter of every word. Can I get only two letters of first two words from string using only RegEx

Expected result is KC using only RegEx

var str = "Keanu Charles Reeves";
console.log(str);
str = str.match(/\b(\w)/g).join('').substring(0, 2);
console.log(str);

So what is the problem? Do you mean you want to get KeCh as a result? — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Nov 28, 2019 at 9:40
@WiktorStribiżew can do this by only RegEx ? only need KC — Jay
– Jay, Commented Nov 28, 2019 at 9:41
You can't unless you use .replace. Something like s.replace(/[^]*?\b(\w)\w*\W+(\w)[^]*|[^]+/, '$1$2') — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Nov 28, 2019 at 9:42
@WiktorStribiżew Yes this is what i am looking for only RegEx Thank you — Jay
– Jay, Commented Nov 28, 2019 at 9:46

Wiktor Stribiżew · Accepted Answer · 2019-11-28 09:53:59Z

1

Your approach is best and you should stick to it.

As an educational-only alternative, you might use a solution based on a .replace method (because all matching methods will require joining multiple matches that you want to avoid, the reason being that you can't match disjoin (non-adjoining) pieces of text into a single group within one match operation):

s.replace(/[^]*?\b(\w)\w*\W+(\w)[^]*|[^]+/, '$1$2')

It matches the string up to the first word char that is captured into Group 1, matches up to the second word capturing its first word char into Group 2 and then matching all the string to the end, or - upon no match - [^]+ grabs the whole string, and replaces the whole string with Group 1 and 2 contents.

See the regex demo

answered Nov 28, 2019 at 9:53

Wiktor Stribiżew

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2 Comments

Jay Over a year ago

Which one is best using RegEx with replace or joining with substring ?

Wiktor Stribiżew Over a year ago

@JayVaghasiya Multiple matches + joining is very clear/readable/maintainable and is thus preferable.

Swapnil Soni · Accepted Answer · 2019-11-28 09:48:36Z

0

As you wrote .substring(0,2) it will take only first 2 letters only just remove it and it will work

var str = "Keanu Charles Reeves";
console.log(str);
str = str.match(/\b(\w)/g).join('');
console.log(str);

answered Nov 28, 2019 at 9:48

Swapnil Soni

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1 Comment

Jay Over a year ago

Only need KC and using only RegEx

zjffun · Accepted Answer · 2019-11-28 09:54:56Z

0

var str = "Keanu Charles Reeves";
str = str.replace(/(\w).*? (\w).*/, "$1$2");
console.log(str);

answered Nov 28, 2019 at 9:54

zjffun

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