add ability to support escapeChar on unparse

papaparse.js

@@ -273,6 +273,9 @@ License: MIT
 		/** quote character */
 		var _quoteChar = '"';
 
+		/** escaped quote character, either "" or <config.escapeChar>" */
+		var _escapedQuote = _quoteChar + _quoteChar;
+
 		/** whether to skip empty lines */
 		var _skipEmptyLines = false;
 
@@ -343,6 +346,10 @@ License: MIT
 
 			if (typeof _config.header === 'boolean')
 				_writeHeader = _config.header;
+
+			if (_config.escapeChar !== undefined) {
+				_escapedQuote = _config.escapeChar + _quoteChar;
+			}
 		}
 
 
@@ -429,7 +436,7 @@ License: MIT
 			if (str.constructor === Date)
 				return JSON.stringify(str).slice(1, 25);
 
-			str = str.toString().replace(quoteCharRegex, _quoteChar + _quoteChar);
+			str = str.toString().replace(quoteCharRegex, _escapedQuote);
 
 			var needsQuotes = (typeof _quotes === 'boolean' && _quotes)
 							|| (Array.isArray(_quotes) && _quotes[col])

tests/test-cases.js

@@ -1732,6 +1732,12 @@ var UNPARSE_TESTS = [
 		input: [{a: null, b: ' '}, {}, {a: '1', b: '2'}],
 		config: {skipEmptyLines: 'greedy', header: true},
 		expected: 'a,b\r\n1,2'
+	},
+	{
+		description: "Use different escapeChar",
+		input: [{a: 'foo', b: '"quoted"'}],
+		config: {header: false, escapeChar: '\\'},
+		expected: 'foo,"\\"quoted\\""'
 	}
 ];