mirror of
https://github.com/alrayyes/wiki.git
synced 2024-11-24 12:36:23 +00:00
47 lines
1.1 KiB
Markdown
47 lines
1.1 KiB
Markdown
---
|
|
date: 2020-11-04
|
|
id: 11d0fefd-c11e-400b-80fd-ba40e94b2a47
|
|
title: JavaScript RegExp Replace Method
|
|
---
|
|
|
|
replace[^1] is a nice way to use regexps to replace text:
|
|
|
|
``` javascript
|
|
console.log("papa".replace("p", "m"));
|
|
console.log("Borobudur".replace(/[ou]/, "a"));
|
|
console.log("Borobudur".replace(/[ou]/g, "a"));
|
|
```
|
|
|
|
You can also use awk like syntax to switch things around:
|
|
|
|
``` javascript
|
|
console.log(
|
|
"Liskov, Barbara\nMcCarthy, John\nWadler, Philip"
|
|
.replace(/(\w+), (\w+)/g, "$2 $1"));
|
|
```
|
|
|
|
You can even pass a function to replace:
|
|
|
|
``` javascript
|
|
let s = "the cia and fbi";
|
|
console.log(s.replace(/\b(fbi|cia)\b/g,
|
|
str => str.toUpperCase()));
|
|
```
|
|
|
|
``` javascript
|
|
let stock = "1 lemon, 2 cabbages, and 101 eggs";
|
|
function minusOne(match, amount, unit) {
|
|
amount = Number(amount) - 1;
|
|
if (amount == 1) { // only one left, remove the 's'
|
|
unit = unit.slice(0, unit.length - 1);
|
|
} else if (amount == 0) {
|
|
amount = "no";
|
|
}
|
|
return amount + " " + unit;
|
|
}
|
|
console.log(stock.replace(/(\d+) (\w+)/g, minusOne));
|
|
```
|
|
|
|
# Footnotes
|
|
|
|
[^1]: <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/replace>
|