diff --git a/src/TexVC/Nodes/TexNode.php b/src/TexVC/Nodes/TexNode.php
index 54d05ac16..24e1f208d 100644
--- a/src/TexVC/Nodes/TexNode.php
+++ b/src/TexVC/Nodes/TexNode.php
@@ -120,14 +120,14 @@ class TexNode {
 
 		// special case #3: \\color, \\pagecolor, \\definecolor
 		$matches = [];
-		$m = preg_match( '/^(\\\\(color|pagecolor|definecolor))/', $t, $matches );
+		$m = preg_match( '/^(\\\\(?:page|define)?color) /', $t, $matches );
 		if ( $m == 1 ) {
 			return self::match( $target, $matches[1] );
 		}
 
 		// special case #4: \\mathbb, \\mathrm
 		$matches = [];
-		$m = preg_match( '/^(\\\\math..) \{(\\.*)}$/', $t, $matches );
+		$m = preg_match( '/^(\\\\math..) \{(\\\\.*)}$/', $t, $matches );
 		if ( $m == 1 ) {
 			return self::match( $target, $matches[1] ) ?: self::match( $target, $matches[2] );
 		}
diff --git a/tests/phpunit/unit/TexVC/Nodes/TexNodeTest.php b/tests/phpunit/unit/TexVC/Nodes/TexNodeTest.php
index 2665b8a3f..031fbd439 100644
--- a/tests/phpunit/unit/TexVC/Nodes/TexNodeTest.php
+++ b/tests/phpunit/unit/TexVC/Nodes/TexNodeTest.php
@@ -137,21 +137,17 @@ class TexNodeTest extends MediaWikiUnitTestCase {
 			[ '\\mismatch', '\\mbox{\\somefunc}', false ],
 			[ '\\somefunc', '\\mbox {\\somefunc}', false ],
 			[ '\\color', '\\color' ],
-			// FIXME: This might be to relaxed; maybe add a \b to the regex?
-			[ '\\color', '\\colorscheme because the rest is ignored' ],
+			[ '\\color', '\\color the rest is ignored' ],
 			[ '\\pagecolor', '\\pagecolor' ],
 			[ '\\definecolor', '\\definecolor' ],
-			[ '\\mathbb', '\\mathbb {}' ],
+			[ '\\mathbb', '\\mathbb {}', false ],
 			[ '\\mathbb', '\\mathbb {A}', false ],
 			[ '\\mathbb', '\\mathbb {foo}', false ],
 			[ '\\mathbb', '\\mathbb{}', false ],
-
-			// FIXME: I believe these don't make sense; mistake in the regex?
-			[ '\\mathbb', '\\mathbb {.}' ],
-			[ '\\mathbb', '\\mathbb {..........}' ],
-			// FIXME: I believe these should both succeed
-			[ '\\mathbb', '\\mathbb {\\foo}', false ],
-			[ '\\foo', '\\mathbb {\\foo}', false ],
+			[ '\\mathbb', '\\mathbb {.}', false ],
+			[ '\\mathbb', '\\mathbb {..........}', false ],
+			[ '\\mathbb', '\\mathbb {\\foo}' ],
+			[ '\\foo', '\\mathbb {\\foo}' ],
 		];
 	}