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5-regular-expressions/09-regexp-groups/3-find-decimal-positive-numbers/solution.md

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+
+An integer number is `pattern:\d+`.
+
+A decimal part is: `pattern:\.\d+`.
+
+Because the decimal part is optional, let's put it in parentheses with quantifier `pattern:'?'`.
+
+Finally we have the regexp: `pattern:\d+(\.\d+)?`:
+
+```js run
+let reg = /\d+(\.\d+)?/g;
+
+let str = "1.5 0 12. 123.4.";
+
+alert( str.match(re) );   // 1.5, 0, 12, 123.4
+```