How can I find a word that preceding to [`¹²³⁴⁵⁶⁷⁸⁹⁰`]. For ex.:

```
let myString = "Regular expressions¹ consist of constants, ² and operator symbols...³"

```

Please, provide a pattern to select characters from start of the target word to superscript:

```
"expressions¹", "constants, ²", "symbols...³"

```

& pattern to select only target word

```
"expressions", "constants", "symbols"

```