fix: accented characters in sequence annotation break properly

Author: seveibar

src/components/SequenceAnnotator/index.story.js

@@ -114,3 +114,17 @@ storiesOf("SequenceAnnotator", module)
       onChange={action("onChange")}
     />
   ))
+  .add("Accented Characters", () => (
+    <SequenceAnnotator
+      type="label-sequence"
+      document={`This should appear as a single word: aùbûcàdâeçfégèhêiëjïkîlôm (and not multiple letters)`}
+      labels={[
+        {
+          color: colors[0],
+          id: "test",
+          displayName: "test"
+        }
+      ]}
+      onChange={action("onChange")}
+    />
+  ))

src/string-to-sequence.js

@@ -1,7 +1,7 @@
 // @flow
 
 const stringToSequence = (doc: string) => {
-  const sepRe = /[a-zA-Z]+/g
+  const sepRe = /[a-zA-ZÀ-ÿ]+/g
   let m
   let indices = [0]
   do {