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Correct spelling

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Daniel 2019-06-28 14:41:55 -04:00
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9-regular-expressions/14-regexp-lookahead-lookbehind/article.md
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@ -40,7 +40,7 @@ The syntax is:
- Positive lookbehind: `pattern:(?<=y)x`, matches `pattern:x`, but only if it follows after `pattern:y`.
- Negative lookbehind: `pattern:(?<!y)x`, matches `pattern:x`, but only if there's no `pattern:y` before.
For example, let's change the price to US dollars. The dollar sign is usually before the number, so to look for `$30` we'll use `pattern:(?<=\$)\d+` -- an amount preceeded by `subject:$`:
For example, let's change the price to US dollars. The dollar sign is usually before the number, so to look for `$30` we'll use `pattern:(?<=\$)\d+` -- an amount preceded by `subject:$`:
```js run
let str = "1 turkey costs $30";
@ -48,7 +48,7 @@ let str = "1 turkey costs $30";
alert( str.match(/(?<=\$)\d+/) ); // 30 (skipped the sole number)
```
And, to find the quantity -- a number, not preceeded by `subject:$`, we can use a negative lookbehind `pattern:(?<!\$)\d+`:
And, to find the quantity -- a number, not preceded by `subject:$`, we can use a negative lookbehind `pattern:(?<!\$)\d+`:
```js run
let str = "2 turkeys cost $60";