diff --git a/src/riscript.js b/src/riscript.js
index f13d752..a6aa27c 100644
--- a/src/riscript.js
+++ b/src/riscript.js
@@ -563,7 +563,7 @@ class RiScript {
       EndingBreak: /\r?\n$/,
       NonGateAtSigns: /([^}])@(?!{)/,
       AnySymbol: new RegExp(`[${anysym}]`),
-      ParenthesizedWeights: /\(\s*(\d+)\s*\)/g, // TODO: change for negative weights
+      ParenthesizedWeights: /\(\s*(-?\d+)\s*\)/g,
       MultiLineComments: /\/\*[^]*?(\r?\n)?\//g,
       SingleLineComments: /\/\/[^\n]+(\r?\n|$)/g,
       MarkdownLinks: /\[([^\]]+)\]\(([^)"]+)(?: \"([^\"]+)\")?\)/g,
diff --git a/src/tokens.js b/src/tokens.js
index 94cb659..deb1262 100644
--- a/src/tokens.js
+++ b/src/tokens.js
@@ -58,7 +58,7 @@ function getTokens(v2Compatible) {
   const Symbol = createToken({ name: "Symbol", pattern: new RegExp(`(${Escaped.DYNAMIC}|${Escaped.STATIC}[A-Za-z_0-9])[A-Za-z_0-9]*(\\(\\))?`) });
   const Transform = createToken({ name: "Transform", pattern: /\.[A-Za-z_0-9][A-Za-z_0-9]*(\(\))?/ });
   const Entity = createToken({ name: "Entity", pattern: ENTITY_PATTERN });
-  const Weight = createToken({ name: "Weight", pattern: new RegExp(`\\s*${Escaped.OPEN_WEIGHT}\\d+${Escaped.CLOSE_WEIGHT}\\s*`) }); // TODO: change for negative weights
+  const Weight = createToken({ name: "Weight", pattern: new RegExp(`\\s*${Escaped.OPEN_WEIGHT}-?\\d+${Escaped.CLOSE_WEIGHT}\\s*`) });
   const PendingGate = createToken({ name: "PendingGate", pattern: PENDING_GATE_PATTERN });
   const Raw = createToken({ name: "Raw", pattern: new RegExp(`[^${Escaped.SPECIAL}]+`) });
 
@@ -100,13 +100,13 @@ function bracketMatch(text, startOffset) {
     charCode = text.charCodeAt(endOffset);
   }
 
-  // No match, must return null xsto conform with the RegExp.prototype.exec signature
+  // No match, must return null to conform with the RegExp.prototype.exec
   if (endOffset === startOffset) {
     if (dbug) console.log(`"${text.substring(startOffset, endOffset)}" -> null3`);
     return null;
   } else {
     let matchedString = text.substring(startOffset, endOffset);
-    // according to the RegExp.prototype.exec API the first item in the returned array must be the whole matched string.
+    // according to RegExp.prototype.exec API first item in the returned array must be the whole matched string
     if (dbug) console.log('  returned -> ', [matchedString]);
     return [matchedString];
   }
diff --git a/test/dist/riscript.tests.js b/test/dist/riscript.tests.js
index 2144325..58756a4 100644
--- a/test/dist/riscript.tests.js
+++ b/test/dist/riscript.tests.js
@@ -393,17 +393,17 @@ describe(title, function() {
       expect(/(man|boy):(man|boy)/.test(res)).true;
     });
     it("Repeat choices with randomSeed", function() {
-      if (!("randomSeed" in riscript.RiTa))
-        return;
-      const seed = Math.random() * Number.MAX_SAFE_INTEGER;
-      const script = "$a=[1|2|3|4|5|6]\n$a";
-      riscript.RiTa.randomSeed(seed);
-      let b;
-      const a = riscript.evaluate(script);
-      for (let i = 0; i < 5; i++) {
+      if ("randomSeed" in riscript.RiTa) {
+        const seed = Math.random() * Number.MAX_SAFE_INTEGER;
+        const script = "$a=[1|2|3|4|5|6]\n$a";
         riscript.RiTa.randomSeed(seed);
-        b = riscript.evaluate(script);
-        expect(a).eq(b);
+        let b;
+        const a = riscript.evaluate(script);
+        for (let i = 0; i < 5; i++) {
+          riscript.RiTa.randomSeed(seed);
+          b = riscript.evaluate(script);
+          expect(a).eq(b);
+        }
       }
     });
     it("Selects non-weighted choices evenly", function() {
diff --git a/test/riscript.tests.js b/test/riscript.tests.js
index 17c74a2..6a7a61c 100644
--- a/test/riscript.tests.js
+++ b/test/riscript.tests.js
@@ -328,7 +328,7 @@ describe(title, function () {
     it('Handles boolean gate logic', function () {
       // reject if no valid conditions
       expect(riscript.evaluate('$a=2\n[ @{$a: {}} hello]')).eq('');
-      
+
       // simple AND
       expect(riscript.evaluate('$a=2\n[ @{$a: {@gt: 3}} hello]')).eq('');
       expect(riscript.evaluate('$a=4\n[ @{$a: {@gt: 3}} hello]')).eq('hello');
@@ -375,7 +375,7 @@ describe(title, function () {
     });
 
     it('Extract operands from gate with object operands', function () {
-      const obj = { $a: 3, '@or': [{ $b: {'@lt': 30 } }, { $c: /^p*/ }] };
+      const obj = { $a: 3, '@or': [{ $b: { '@lt': 30 } }, { $c: /^p*/ }] };
       const query = new RiScript.Query(riscript, obj);
       const operands = query.operands(riscript, obj);
       expect(operands).eql(['a', 'c', 'b']);
@@ -389,8 +389,8 @@ describe(title, function () {
     });
 
     it('Calls test on RiQuery', function () {
-    const obj = { $a: 3, '@or': [{ $b: {'@lt': 30 } }, { $c: /^p*/ }] };
-    const query = new RiScript.Query(riscript, obj);
+      const obj = { $a: 3, '@or': [{ $b: { '@lt': 30 } }, { $c: /^p*/ }] };
+      const query = new RiScript.Query(riscript, obj);
       const res = query.test({ a: 3, b: 10 });
       expect(res).true;
     });
@@ -519,17 +519,18 @@ describe(title, function () {
     });
 
     it('Repeat choices with randomSeed', function () {
-      if (!('randomSeed' in riscript.RiTa)) return;
-      const seed = Math.random() * Number.MAX_SAFE_INTEGER;
-      const script = '$a=[1|2|3|4|5|6]\n$a';
-      riscript.RiTa.randomSeed(seed); // TODO: How to handle with no RiTa ?
-      let b;
-      const a = riscript.evaluate(script);
-      for (let i = 0; i < 5; i++) {
+      if ('randomSeed' in riscript.RiTa) {
+        const seed = Math.random() * Number.MAX_SAFE_INTEGER;
+        const script = '$a=[1|2|3|4|5|6]\n$a';
         riscript.RiTa.randomSeed(seed); // TODO: How to handle with no RiTa ?
-        b = riscript.evaluate(script);
-        // console.log(i + ') ', a, b);
-        expect(a).eq(b);
+        let b;
+        const a = riscript.evaluate(script);
+        for (let i = 0; i < 5; i++) {
+          riscript.RiTa.randomSeed(seed); // TODO: How to handle with no RiTa ?
+          b = riscript.evaluate(script);
+          // console.log(i + ') ', a, b);
+          expect(a).eq(b);
+        }
       }
     });
 
@@ -1175,7 +1176,8 @@ describe(title, function () {
       expect(riscript.evaluate('$.uppercase()')).eq('');
       expect(riscript.evaluate('$.capB()', ctx)).eq('B');
       expect(riscript.evaluate('$.uppercase', 0)).eq('');
-      expect(riscript.evaluate('[].capB', ctx)).eq('B');    });
+      expect(riscript.evaluate('[].capB', ctx)).eq('B');
+    });
 
     it('Resolves transforms containing riscript', function () {
       let ctx;