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Ilya Kantor 2019-07-25 17:23:58 +03:00
parent 876674fc37
commit a0853ed30a
2 changed files with 6 additions and 9 deletions
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1-js/01-getting-started/1-intro/article.md
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@ -92,10 +92,7 @@ JavaScript is the only browser technology that combines these three things.
That's what makes JavaScript unique. That's why it's the most widespread tool for creating browser interfaces. That's what makes JavaScript unique. That's why it's the most widespread tool for creating browser interfaces.
Moreover, frameworks like react native and ionic lets us develop mobile applications using JavaScript. That said, JavaScript also allows to create servers, mobile applications, etc.
While planning to learn a new technology, it's beneficial to check its perspectives. So let's move on to the modern trends affecting it, including new languages and browser abilities.
## Languages "over" JavaScript ## Languages "over" JavaScript

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9-regular-expressions/14-regexp-lookahead-lookbehind/1-find-non-negative-integers/solution.md
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@ -1,9 +1,9 @@
A number is `pattern:\d+`. The regexp for an integer number is `pattern:\d+`.
We can exclude negatives by prepending it with the negative lookahead: `pattern:(?<!-)\d+`. We can exclude negatives by prepending it with the negative lookahead: `pattern:(?<!-)\d+`.
If we try it now, we may notice one more "extra" result: Although, if we try it now, we may notice one more "extra" result:
```js run ```js run
let reg = /(?<!-)\d+/g; let reg = /(?<!-)\d+/g;
@ -13,11 +13,11 @@ let str = "0 12 -5 123 -18";
console.log( str.match(reg) ); // 0, 12, 123, *!*8*/!* console.log( str.match(reg) ); // 0, 12, 123, *!*8*/!*
``` ```
It matches `match:8` of `subject:-18`. To exclude it, we need to ensure that the regexp starts matching a number not from the middle of another number. As you can see, it matches `match:8`, from `subject:-18`. To exclude it, we need to ensure that the regexp starts matching a number not from the middle of another (non-matching) number.
We can do it by specifying another negative lookbehind: `pattern:(?<!-)(?<!\d)\d+`. Now `pattern:(?<!\d)` ensures that a match does not start after another digit. We can do it by specifying another negative lookbehind: `pattern:(?<!-)(?<!\d)\d+`. Now `pattern:(?<!\d)` ensures that a match does not start after another digit, just what we need.
Or we can use a single lookbehind here: We can also join them into a single lookbehind here:
```js run ```js run
let reg = /(?<![-\d])\d+/g; let reg = /(?<![-\d])\d+/g;