fix assign tag regex to include linebreaks in value

dist/liquid.common.js

@@ -2225,7 +2225,7 @@ function For (liquid, Liquid) {
 }
 
 function Assign (liquid, Liquid) {
-  var re = new RegExp('(' + identifier.source + ')\\s*=(.*)');
+  var re = new RegExp('(' + identifier.source + ')\\s*=([^]*)');
   var AssignScope = Liquid.Types.AssignScope;
 
 

dist/liquid.js

@@ -2171,7 +2171,7 @@
   }
 
   function Assign (liquid, Liquid) {
-    var re = new RegExp('(' + identifier.source + ')\\s*=(.*)');
+    var re = new RegExp('(' + identifier.source + ')\\s*=([^]*)');
     var AssignScope = Liquid.Types.AssignScope;
 
 

src/tags/assign.js

@@ -3,7 +3,7 @@ import {identifier} from '../lexical.js'
 import {create} from '../util/underscore.js'
 
 export default function (liquid, Liquid) {
-  const re = new RegExp(`(${identifier.source})\\s*=(.*)`)
+  const re = new RegExp(`(${identifier.source})\\s*=([^]*)`)
   const {AssignScope} = Liquid.Types
 
   liquid.registerTag('assign', {

test/unit/tags/assign.js

@@ -41,6 +41,14 @@ describe('tags/assign', function () {
     return expect(liquid.parseAndRender(src))
       .to.eventually.equal('A')
   })
+  it('should assign as filter across multiple lines as result', function () {
+    const src = `{% assign foo="a b"
+    | capitalize
+    | split: " "
+    | first %}{{foo}}`
+    return expect(liquid.parseAndRender(src))
+      .to.eventually.equal('A')
+  })
   it('should assign var-1', function () {
     const src = '{% assign var-1 = 5 %}{{ var-1 }}'
     return expect(liquid.parseAndRender(src)).to.eventually.equal('5')