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