vendor regex-escaping code

Author: lobsterkatie

packages/utils/src/string.ts

@@ -101,3 +101,20 @@ export function isMatchingPattern(value: string, pattern: RegExp | string): bool
   }
   return false;
 }
+
+/**
+ * Given a string, escape characters which have meaning in the regex grammar, such that the result is safe to feed to
+ * `new RegExp()`.
+ *
+ * Based on https://github.com/sindresorhus/escape-string-regexp. Vendored to a) reduce the size by skipping the runtime
+ * type-checking, and b) ensure it gets down-compiled for old versions of Node (the published package only supports Node
+ * 12+).
+ *
+ * @param regexString The string to escape
+ * @returns An version of the string with all special regex characters escaped
+ */
+export function escapeStringForRegex(regexString: string): string {
+  // escape the hyphen separately so we can also replace it with a unicode literal hyphen, to avoid the problems
+  // discussed in https://github.com/sindresorhus/escape-string-regexp/issues/20.
+  return regexString.replace(/[|\\{}()[\]^$+*?.]/g, '\\$&').replace(/-/g, '\\x2d');
+}