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/**
Escape RegExp special characters.
You can also use this to escape a string that is inserted into the middle of a regex, for example, into a character class.
@example
```
import escapeStringRegexp from 'escape-string-regexp';
const escapedString = escapeStringRegexp('How much $ for a 🦄?');
//=> 'How much \\$ for a 🦄\\?'
new RegExp(escapedString);
```
*/
export default function escapeStringRegexp(string: string): string;
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