diff --git a/CHANGELOG.md b/CHANGELOG.md
index b051bbf9dc9c..efaf131d9ba4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Don't mutate custom color palette when overriding per-plugin colors ([#6546](https://github.com/tailwindlabs/tailwindcss/pull/6546))
 - Improve circular dependency detection when using `@apply` ([#6588](https://github.com/tailwindlabs/tailwindcss/pull/6588))
 - Only generate variants for non-`user` layers ([#6589](https://github.com/tailwindlabs/tailwindcss/pull/6589))
+- Properly extract classes with arbitrary values in arrays and classes followed by escaped quotes ([#6590](https://github.com/tailwindlabs/tailwindcss/pull/6590))
 
 ## [3.0.6] - 2021-12-16
 
diff --git a/src/lib/defaultExtractor.js b/src/lib/defaultExtractor.js
new file mode 100644
index 000000000000..32c18fe6bca2
--- /dev/null
+++ b/src/lib/defaultExtractor.js
@@ -0,0 +1,31 @@
+const PATTERNS = [
+  /(?:\['([^'\s]+[^<>"'`\s:\\])')/.source, // ['text-lg' -> text-lg
+  /(?:\["([^"\s]+[^<>"'`\s:\\])")/.source, // ["text-lg" -> text-lg
+  /(?:\[`([^`\s]+[^<>"'`\s:\\])`)/.source, // [`text-lg` -> text-lg
+  /([^<>"'`\s]*\[\w*'[^"`\s]*'?\])/.source, // font-['some_font',sans-serif]
+  /([^<>"'`\s]*\[\w*"[^'`\s]*"?\])/.source, // font-["some_font",sans-serif]
+  /([^<>"'`\s]*\[\w*\('[^"'`\s]*'\)\])/.source, // bg-[url('...')]
+  /([^<>"'`\s]*\[\w*\("[^"'`\s]*"\)\])/.source, // bg-[url("...")]
+  /([^<>"'`\s]*\[\w*\('[^"`\s]*'\)\])/.source, // bg-[url('...'),url('...')]
+  /([^<>"'`\s]*\[\w*\("[^'`\s]*"\)\])/.source, // bg-[url("..."),url("...")]
+  /([^<>"'`\s]*\['[^"'`\s]*'\])/.source, // `content-['hello']` but not `content-['hello']']`
+  /([^<>"'`\s]*\["[^"'`\s]*"\])/.source, // `content-["hello"]` but not `content-["hello"]"]`
+  /([^<>"'`\s]*\[[^<>"'`\s]*:'[^"'`\s]*'\])/.source, // `[content:'hello']` but not `[content:"hello"]`
+  /([^<>"'`\s]*\[[^<>"'`\s]*:"[^"'`\s]*"\])/.source, // `[content:"hello"]` but not `[content:'hello']`
+  /([^<>"'`\s]*\[[^"'`\s]+\][^<>"'`\s]*)/.source, // `fill-[#bada55]`, `fill-[#bada55]/50`
+  /([^<>"'`\s]*[^"'`\s:\\])/.source, //  `px-1.5`, `uppercase` but not `uppercase:`
+].join('|')
+
+const BROAD_MATCH_GLOBAL_REGEXP = new RegExp(PATTERNS, 'g')
+const INNER_MATCH_GLOBAL_REGEXP = /[^<>"'`\s.(){}[\]#=%]*[^<>"'`\s.(){}[\]#=%:]/g
+
+/**
+ * @param {string} content
+ */
+export function defaultExtractor(content) {
+  let broadMatches = content.matchAll(BROAD_MATCH_GLOBAL_REGEXP)
+  let innerMatches = content.match(INNER_MATCH_GLOBAL_REGEXP) || []
+  let results = [...broadMatches, ...innerMatches].flat().filter((v) => v !== undefined)
+
+  return results
+}
diff --git a/src/lib/expandTailwindAtRules.js b/src/lib/expandTailwindAtRules.js
index 087a671ea17a..addf2c666169 100644
--- a/src/lib/expandTailwindAtRules.js
+++ b/src/lib/expandTailwindAtRules.js
@@ -3,33 +3,12 @@ import * as sharedState from './sharedState'
 import { generateRules } from './generateRules'
 import bigSign from '../util/bigSign'
 import cloneNodes from '../util/cloneNodes'
+import { defaultExtractor } from './defaultExtractor'
 
 let env = sharedState.env
 
-const PATTERNS = [
-  /([^<>"'`\s]*\[\w*'[^"`\s]*'?\])/.source, // font-['some_font',sans-serif]
-  /([^<>"'`\s]*\[\w*"[^"`\s]*"?\])/.source, // font-["some_font",sans-serif]
-  /([^<>"'`\s]*\[\w*\('[^"'`\s]*'\)\])/.source, // bg-[url('...')]
-  /([^<>"'`\s]*\[\w*\("[^"'`\s]*"\)\])/.source, // bg-[url("...")]
-  /([^<>"'`\s]*\[\w*\('[^"`\s]*'\)\])/.source, // bg-[url('...'),url('...')]
-  /([^<>"'`\s]*\[\w*\("[^'`\s]*"\)\])/.source, // bg-[url("..."),url("...")]
-  /([^<>"'`\s]*\['[^"'`\s]*'\])/.source, // `content-['hello']` but not `content-['hello']']`
-  /([^<>"'`\s]*\["[^"'`\s]*"\])/.source, // `content-["hello"]` but not `content-["hello"]"]`
-  /([^<>"'`\s]*\[[^<>"'`\s]*:'[^"'`\s]*'\])/.source, // `[content:'hello']` but not `[content:"hello"]`
-  /([^<>"'`\s]*\[[^<>"'`\s]*:"[^"'`\s]*"\])/.source, // `[content:"hello"]` but not `[content:'hello']`
-  /([^<>"'`\s]*\[[^"'`\s]+\][^<>"'`\s]*)/.source, // `fill-[#bada55]`, `fill-[#bada55]/50`
-  /([^<>"'`\s]*[^"'`\s:])/.source, //  `px-1.5`, `uppercase` but not `uppercase:`
-].join('|')
-const BROAD_MATCH_GLOBAL_REGEXP = new RegExp(PATTERNS, 'g')
-const INNER_MATCH_GLOBAL_REGEXP = /[^<>"'`\s.(){}[\]#=%]*[^<>"'`\s.(){}[\]#=%:]/g
-
 const builtInExtractors = {
-  DEFAULT: (content) => {
-    let broadMatches = content.match(BROAD_MATCH_GLOBAL_REGEXP) || []
-    let innerMatches = content.match(INNER_MATCH_GLOBAL_REGEXP) || []
-
-    return [...broadMatches, ...innerMatches]
-  },
+  DEFAULT: defaultExtractor,
 }
 
 const builtInTransformers = {
diff --git a/tests/default-extractor.test.js b/tests/default-extractor.test.js
new file mode 100644
index 000000000000..08315ca49a89
--- /dev/null
+++ b/tests/default-extractor.test.js
@@ -0,0 +1,108 @@
+import { html } from './util/run'
+import { defaultExtractor } from '../src/lib/defaultExtractor'
+
+const input = html`
+  <div class="font-['some_font',sans-serif]"></div>
+  <div class='font-["some_font",sans-serif]'></div>
+  <div class="bg-[url('...')]"></div>
+  <div class="bg-[url("...")]"></div>
+  <div class="bg-[url('...'),url('...')]"></div>
+  <div class="bg-[url("..."),url("...")]"></div>
+  <div class="content-['hello']"></div>
+  <div class="content-['hello']']"></div>
+  <div class="content-["hello"]"></div>
+  <div class="content-["hello"]"]"></div>
+  <div class="[content:'hello']"></div>
+  <div class="[content:"hello"]"></div>
+  <div class="[content:"hello"]"></div>
+  <div class="[content:'hello']"></div>
+  <div class="fill-[#bada55]"></div>
+  <div class="fill-[#bada55]/50"></div>
+  <div class="px-1.5"></div>
+  <div class="uppercase"></div>
+  <div class="uppercase:"></div>
+  <div class="hover:font-bold"></div>
+  <div class="content-['>']"></div>
+
+  <script>
+    let classes01 = ["text-[10px]"]
+    let classes02 = ["hover:font-bold"]
+    let classes03 = {"code": "<div class=\"text-sm text-blue-500\"></div>"}
+    let classes04 = ['text-[11px]']
+    let classes05 = ['text-[21px]', 'text-[22px]', 'lg:text-[24px]']
+    let classes06 = ["text-[31px]", "text-[32px]"]
+    let classes07 = [${'`'}text-[41px]${'`'}, ${'`'}text-[42px]${'`'}]
+    let classes08 = {"text-[51px]":"text-[52px]"}
+    let classes09 = {'text-[61px]':'text-[62px]'}
+    let classes10 = {${'`'}text-[71px]${'`'}:${'`'}text-[72px]${'`'}}
+    let classes11 = ['hover:']
+    let classes12 = ['hover:\'abc']
+    let classes13 = ["lg:text-[4px]"]
+    let classes14 = ["<div class='hover:test'>"]
+
+    let obj = {
+      uppercase:true
+    }
+  </script>
+`
+
+const includes = [
+  `font-['some_font',sans-serif]`,
+  `font-["some_font",sans-serif]`,
+  `bg-[url('...')]`,
+  `bg-[url("...")]`,
+  `bg-[url('...'),url('...')]`,
+  `bg-[url("..."),url("...")]`,
+  `content-['hello']`,
+  `content-["hello"]`,
+  `[content:'hello']`,
+  `[content:"hello"]`,
+  `[content:"hello"]`,
+  `[content:'hello']`,
+  `fill-[#bada55]`,
+  `fill-[#bada55]/50`,
+  `px-1.5`,
+  `uppercase`,
+  `hover:font-bold`,
+  `text-sm`,
+  `text-[10px]`,
+  `text-[11px]`,
+  `text-blue-500`,
+  `text-[21px]`,
+  `text-[22px]`,
+  `text-[31px]`,
+  `text-[32px]`,
+  `text-[41px]`,
+  `text-[42px]`,
+  `text-[51px]`,
+  `text-[52px]`,
+  `text-[61px]`,
+  `text-[62px]`,
+  `text-[71px]`,
+  `text-[72px]`,
+  `lg:text-[4px]`,
+  `lg:text-[24px]`,
+  `content-['>']`,
+  `hover:test`,
+]
+
+const excludes = [
+  `uppercase:`,
+  'hover:',
+  "hover:'abc",
+  `font-bold`,
+  `<div class='hover:test'>`,
+  `test`,
+]
+
+test('The default extractor works as expected', async () => {
+  const extractions = defaultExtractor(input.trim())
+
+  for (const str of includes) {
+    expect(extractions).toContain(str)
+  }
+
+  for (const str of excludes) {
+    expect(extractions).not.toContain(str)
+  }
+})