Given this text
unit: 100 street: 200 city: 300
How do I write a regex that will give this output as different groups in JS. I also need to mention that the text may not contain street or city. It could just be unit: 100.
group[1] - 100
group[2] - 200
group[3] - 300
Where I'm at so far - unit:\s(.*?)\s(?:.*|$)
Not sure how to proceed further and get all 3 groups in one regex!
You may do this using split as well:
const s = 'unit: 100 street: 200 city: 300';
var arr = s.split(/\s*\w+:\s*/).filter(Boolean);
console.log( arr );
//=> ["100", "200", "300"]Here \s*\w+:\s* matches 0 or more spaces, followed by 1+ word characters then : and 0 or more whitespaces.
Note the filter(Boolean) is just used to remove empty elements from resulting array.
You can use a single capture group:
[^\s:]+:[^\S\n]*(\S+)
const regex = /[^\s:]+:[^\S\n]*(\S+)/g;
[
`unit: 100 street: 200 city: 300`,
`unit: 100`
].forEach(s =>
console.log(
Array.from(s.matchAll(regex), m => m[1])
)
);Or you can use optional nested groups, but the pattern will be longer if you want to use more groups:
[^\s:]+:[^\S\n]*(\S+)(?:[^\S\n]+[^\s:]+:[^\S\n]*(\S+)(?:[^\S\n]+[^\s:]+:[^\S\n]*(\S+))?)?
We can use match() here:
var input = "unit: 100 street: 200 city: 300";
var matches = input.match(/(?<=: ).*?(?=\s*\w+:|$)/g);
console.log(matches);
const rgx = /\D*(\d)(\d)+/g
| Segment | Description |
|---|---|
\D* |
Zero or more non-digits |
(\d) |
First capture group of a digit |
(\d)+ |
Second capture group of one or more digits |
g |
global flag |
.replace() with
"group[$1] - $1$2$2\n"
| Segment | Description |
|---|---|
group[$1] |
Replace with literal: group[, then the first capture group of (\d), and then a literal: ] |
- |
Then a space, a literal hyphen -, and a space |
$1$2$2\n |
Next, the first capture group again: (\d), then the second capture group: (\d)+ twice, and finally a newline |
Example A
const str = `unit: 100 street: 200 city: 300`;
const rgx = /\D*(\d)(\d)+/g;
const res = str.replace(rgx, "group[$1] - $1$2$2\n");
console.log(res);Note: The following comment was not considered in Example A:
It need not be numbers, could be any text."
The question should have this criteria added and an appropriate example:
'unit: 100 street: Main city: Springfield'
Because of this part: group[?], more than one method is needed. See Example B for a solution.
Example B
const str = 'unit: 100 street: Main city: Springfield';
const rgx = /\b(\w+:) ([\w]+)/g;
const res = str.replace(rgx, "$2")
.split(' ')
.map((s, i) =>
"group["+(i + 1)+"] - "+s).join('\n');
console.log(res);
/:\s(\d{3})/?