added basic support for regex

Author: thomas4019

README.md

@@ -41,6 +41,8 @@ The first parameter is the name of your jsonb column in your postgres table. The
 * $or, $not
 * [$in](https://docs.mongodb.org/manual/reference/operator/query/in/#use-the-in-operator-to-match-values-in-an-array), $nin
 * $elemMatch
+* [$regex](https://docs.mongodb.com/manual/reference/operator/query/regex/)
+
 
 ## Todo
 * $nor

index.js

@@ -20,6 +20,7 @@ var pathToText = function(path, isString) {
 	return text;
 }
 
+// These are the simple operators.
 var ops = {
 	$eq: '=',
 	$gt: '>',
@@ -30,7 +31,7 @@ var ops = {
 }
 
 var otherOps = {
-	$in: true, $nin: true, $not: true, $or: true, $and: true, $elemMatch: true
+	$in: true, $nin: true, $not: true, $or: true, $and: true, $elemMatch: true, $regex: true
 }
 
 var convert = function (path, query) {
@@ -54,6 +55,12 @@ var convert = function (path, query) {
 						return '('+query[key].map(function(subquery) {return convert(path, subquery) })
 							.join(key == '$or' ? ' OR ' : ' AND ')+')';
 					}
+				} else if (key == '$regex') {
+					var op = '~';
+					if (query['$options'] && query['$options'].includes('i')) {
+						op += '*';
+					}
+					return pathToText(path, true) + ' ' + op + ' \'' + stringEscape(value) + '\'';
 				} else if (key == '$elemMatch') {
 					return pathToText(path, false) + ' @> \'' + stringEscape(JSON.stringify(query[key])) + '\'::jsonb';
 				} else if (key == '$in' || key == '$nin') {

package.json

@@ -1,16 +1,19 @@
 {
   "name": "mongo-query-to-postgres-jsonb",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "Converts MongoDB queries to postgresql queries for jsonb fields.",
   "main": "index.js",
   "directories": {
     "test": "test"
   },
-  "dependencies": {},
+  "dependencies": {
+    "chai": "^3.5.0",
+    "mocha": "^3.2.0"
+  },
   "devDependencies": {},
-  "repository" : {
-    "type" : "git",
-    "url" : "https://github.com/thomas4019/mongo-query-to-postgres-jsonb.git"
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/thomas4019/mongo-query-to-postgres-jsonb.git"
   },
   "scripts": {
     "test": "mocha"

test/test.js

@@ -103,6 +103,15 @@ describe('comparision operators', function() {
 	});
 });
 
+describe('regular expressions', function() {
+	it('basic', function () {
+		assert.equal("data->>'type' ~ 'food'", convert('data', { type: { $regex : 'food' } }));
+	});
+	it('case insensitive', function () {
+		assert.equal("data->>'type' ~* 'food'", convert('data', { type: { $regex : 'food', $options: 'i' } }));
+	});
+});
+
 describe('combined tests', function () {
 	it('should handle ANDs and ORs together', function() {
 		assert.equal('(data->>\'type\'=\'food\' and (data->\'qty\'>\'100\'::jsonb OR data->\'price\'<\'9.95\'::jsonb))', convert('data', {