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Ilya Kantor 2019-01-14 16:59:56 +03:00
parent 8f2705253a
commit 4974ad9fa7
2 changed files with 8 additions and 6 deletions
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10
5-regular-expressions/09-regexp-groups/3-find-decimal-positive-numbers/solution.md
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@ -1,16 +1,18 @@
An integer number is `pattern:\d+`.
An non-negative integer number is `pattern:\d+`. We should exclude `0` as the first digit, as we don't need zero, but we can allow it in further digits.
So that gives us `pattern:[1-9]\d*`.
A decimal part is: `pattern:\.\d+`.
Because the decimal part is optional, let's put it in parentheses with the quantifier `pattern:'?'`.
Finally we have the regexp: `pattern:\d+(\.\d+)?`:
Finally we have the regexp: `pattern:[1-9]\d*(\.\d+)?`:
```js run
let reg = /\d+(\.\d+)?/g;
let reg = /[1-9]\d*(\.\d+)?/g;
let str = "1.5 0 12. 123.4.";
let str = "1.5 0 -5 12. 123.4.";
alert( str.match(reg) ); // 1.5, 0, 12, 123.4
```