Fix paragraph splits on RN (#8915)

* Make sure regex is applied in multiple lines.

* Add entry point for React Native.

packages/block-library/package.json

@@ -18,6 +18,7 @@
 	},
 	"main": "build/index.js",
 	"module": "build-module/index.js",
+	"react-native": "src/index",
 	"dependencies": {
 		"@babel/runtime": "^7.0.0-beta.52",
 		"@wordpress/api-fetch": "file:../api-fetch",

packages/editor/src/components/rich-text/index.native.js

@@ -30,8 +30,8 @@ export class RichText extends Component {
 		this.lastEventCount = event.nativeEvent.eventCount;
 		// The following method just cleans up any <p> tags produced by aztec and replaces them with a br tag
 		// This should be removed on a later version when aztec doesn't return the top tag of the text being edited
-		const openingTagRegexp = RegExp( '^<' + this.props.tagName + '>', 'gi' );
-		const closingTagRegexp = RegExp( '</' + this.props.tagName + '>$', 'gi' );
+		const openingTagRegexp = RegExp( '^<' + this.props.tagName + '>', 'gim' );
+		const closingTagRegexp = RegExp( '</' + this.props.tagName + '>$', 'gim' );
 		const contentWithoutRootTag = event.nativeEvent.text.replace( openingTagRegexp, '' ).replace( closingTagRegexp, '' );
 		this.lastContent = contentWithoutRootTag;