Implements support for quoted values (#46)

Author: cdimascio

src/main/java/io/github/cdimascio/dotenv/internal/DotenvParser.java

@@ -19,7 +19,17 @@
 public class DotenvParser {
 
     private static final Pattern WHITE_SPACE_REGEX = Pattern.compile("^\\s*$"); // ^\s*${'$'}
-    private static final Pattern DOTENV_ENTRY_REGEX = Pattern.compile("^\\s*([\\w.\\-]+)\\s*(=)\\s*([^#]*)?\\s*(#.*)?$"); // ^\s*([\w.\-]+)\s*(=)\s*([^#]*)?\s*(#.*)?$
+
+    // The follow regex matches key values.
+    // It supports quoted values surrounded by single or double quotes
+    // -  Single quotes: ['][^']*[']
+    //    The above regex snippet matches a value wrapped in single quotes.
+    //    The regex snippet does not match internal single quotes. This is present to allow the trailing comment to include single quotes
+    // -  Double quotes: same logic as single quotes
+    // It ignore trailing comments
+    // - Trailing comment: \s*(#.*)?$
+    //   The above snippet ignore spaces, the captures the # and the trailing comment
+    private static final Pattern DOTENV_ENTRY_REGEX = Pattern.compile("^\\s*([\\w.\\-]+)\\s*(=)\\s*(['][^']*[']|[\"][^\"]*[\"]|[^#]*)?\\s*(#.*)?$"); //"^\\s*([\\w.\\-]+)\\s*(=)\\s*([^#]*)?\\s*(#.*)?$"); // ^\s*([\w.\-]+)\s*(=)\s*([^#]*)?\s*(#.*)?$
 
     private final DotenvReader reader;
     private final boolean throwIfMissing;

src/test/java/tests/BasicTests.java

@@ -16,6 +16,7 @@ public class BasicTests {
         put("WITHOUT_VALUE", "");
         put("MULTI_LINE", "hello\\nworld");
         put("TRAILING_COMMENT", "value");
+        put("QUOTED_VALUE", "iH4>hb_d0#_GN8d]6");
     }};
 
     @Test(expected = DotenvException.class)

src/test/resources/.env

@@ -4,6 +4,7 @@ MY_TEST_EV2=my test ev 2
 WITHOUT_VALUE=
 MULTI_LINE=hello\nworld
 TRAILING_COMMENT=value # comment
+QUOTED_VALUE="iH4>hb_d0#_GN8d]6" # comment "test"
 
 ## Malformed EV!
 MY_TEST_EV3

src/test/resources/env

@@ -4,6 +4,7 @@ MY_TEST_EV2=my test ev 2
 WITHOUT_VALUE=
 MULTI_LINE=hello\nworld
 TRAILING_COMMENT=value # comment
+QUOTED_VALUE="iH4>hb_d0#_GN8d]6" # comment "test"
 
 ## Malformed EV!
 MY_TEST_EV3