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10-regular-expressions/09-regexp-groups/4-find-decimal-numbers/solution.md

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+A positive number with an optional decimal part is (per previous task): `pattern:\d+(\.\d+)?`.
+
+Let's add an optional `-` in the beginning:
+
+```js run
+let reg = /-?\d+(\.\d+)?/g;
+
+let str = "-1.5 0 2 -123.4.";
+
+alert( str.match(reg) );   // -1.5, 0, 2, -123.4
+```

10-regular-expressions/09-regexp-groups/4-find-decimal-numbers/task.md

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+# Find all numbers
+
+Write a regexp that looks for all decimal numbers including integer ones, with the floating point and negative ones.
+
+An example of use:
+
+```js
+let reg = /your regexp/g;
+
+let str = "-1.5 0 2 -123.4.";
+
+alert( str.match(re) ); // -1.5, 0, 2, -123.4
+```