Tidy up code to normalize text, extract text helpers

app/javascript/helpers/text_helpers.js

@@ -1,3 +1,13 @@
 export function isMultiLineString(string) {
   return /\r|\n/.test(string)
 }
+
+export function normalizeFilteredText(string) {
+  return string
+    .toLowerCase()
+    .normalize("NFD").replace(/[\u0300-\u036f]/g, "") // Remove diacritics
+}
+
+export function filterMatches(text, potentialMatch) {
+  return normalizeFilteredText(text).includes(normalizeFilteredText(potentialMatch))
+}