diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/lib/blink.js b/lib/blink.js
index c391a9f..e3a9ecf 100644
--- a/lib/blink.js
+++ b/lib/blink.js
@@ -1,7 +1,7 @@
 var marked = require('marked')
 
 module.exports = function (str) {
-  var md = marked(str)
-  // TODO
-  return null
+    var md = marked(str)
+    // TODO
+    return md.replace(/@@([\w\W]+?)\@@/g, `<blink>$1</blink>`);
 }
\ No newline at end of file
diff --git a/lib/capture.js b/lib/capture.js
index a08ee57..ade6d7f 100644
--- a/lib/capture.js
+++ b/lib/capture.js
@@ -1,3 +1,9 @@
 module.exports = function (str) {
-  // TODO
+    // TODO
+    let res;
+
+    res = str.match(/x=(\d+)/);
+    // console.log(res)
+    res = res && res[1] || null;
+    return res;
 }
\ No newline at end of file
diff --git a/lib/capture_breakword.js b/lib/capture_breakword.js
index a08ee57..1d766ce 100644
--- a/lib/capture_breakword.js
+++ b/lib/capture_breakword.js
@@ -1,3 +1,9 @@
 module.exports = function (str) {
-  // TODO
+    // TODO
+    let res;
+    res = str.match(/\bx=(\d+)\b/);
+    // console.log(res)
+    res = res && res[1] || null;
+    return res;
+
 }
\ No newline at end of file
diff --git a/lib/quantified_group.js b/lib/quantified_group.js
index a08ee57..3afb5a8 100644
--- a/lib/quantified_group.js
+++ b/lib/quantified_group.js
@@ -1,3 +1,4 @@
 module.exports = function (str) {
-  // TODO
+    // TODO
+    return /^(0x[a-fA-F\d]{2}\s*){8}$/.test(str);
 }
\ No newline at end of file
diff --git a/lib/quotes.js b/lib/quotes.js
index a08ee57..fb1c9d5 100644
--- a/lib/quotes.js
+++ b/lib/quotes.js
@@ -1,3 +1,8 @@
 module.exports = function (str) {
-  // TODO
+    // TODO
+    let res;
+
+    res = str.match(/".*?"/g);
+    // console.log(res)
+    return res;
 }
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..8afcc7f
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,286 @@
+{
+  "name": "exercise7",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "http://registry.npm.taobao.org/balanced-match/download/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "http://registry.npm.taobao.org/brace-expansion/download/brace-expansion-1.1.11.tgz",
+      "integrity": "sha1-PH/L9SnYcibz0vUrlm/1Jx60Qd0=",
+      "dev": true,
+      "requires": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "http://registry.npm.taobao.org/browser-stdout/download/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
+    "commander": {
+      "version": "2.9.0",
+      "resolved": "http://registry.npm.taobao.org/commander/download/commander-2.9.0.tgz",
+      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
+      "dev": true,
+      "requires": {
+        "graceful-readlink": ">= 1.0.0"
+      }
+    },
+    "concat-map": {
+      "version": "0.0.1",
+      "resolved": "http://registry.npm.taobao.org/concat-map/download/concat-map-0.0.1.tgz",
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
+      "dev": true
+    },
+    "debug": {
+      "version": "2.6.8",
+      "resolved": "http://registry.npm.taobao.org/debug/download/debug-2.6.8.tgz",
+      "integrity": "sha1-5zFTHKLt4n0YgiJCfaF4IdaP9Pw=",
+      "dev": true,
+      "requires": {
+        "ms": "2.0.0"
+      }
+    },
+    "diff": {
+      "version": "3.2.0",
+      "resolved": "http://registry.npm.taobao.org/diff/download/diff-3.2.0.tgz",
+      "integrity": "sha1-yc45Okt8vQsFinJck98pkCeGj/k=",
+      "dev": true
+    },
+    "escape-string-regexp": {
+      "version": "1.0.5",
+      "resolved": "http://registry.npm.taobao.org/escape-string-regexp/download/escape-string-regexp-1.0.5.tgz",
+      "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
+      "dev": true
+    },
+    "fs.realpath": {
+      "version": "1.0.0",
+      "resolved": "http://registry.npm.taobao.org/fs.realpath/download/fs.realpath-1.0.0.tgz",
+      "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
+      "dev": true
+    },
+    "glob": {
+      "version": "7.1.1",
+      "resolved": "http://registry.npm.taobao.org/glob/download/glob-7.1.1.tgz",
+      "integrity": "sha1-gFIR3wT6rxxjo2ADBs31reULLsg=",
+      "dev": true,
+      "requires": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.0.2",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      }
+    },
+    "graceful-readlink": {
+      "version": "1.0.1",
+      "resolved": "http://registry.npm.taobao.org/graceful-readlink/download/graceful-readlink-1.0.1.tgz",
+      "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=",
+      "dev": true
+    },
+    "growl": {
+      "version": "1.9.2",
+      "resolved": "http://registry.npm.taobao.org/growl/download/growl-1.9.2.tgz",
+      "integrity": "sha1-Dqd0NxXbjY3ixe3hd14bRayFwC8=",
+      "dev": true
+    },
+    "has-flag": {
+      "version": "1.0.0",
+      "resolved": "http://registry.npm.taobao.org/has-flag/download/has-flag-1.0.0.tgz",
+      "integrity": "sha1-nZ55MWXOAXoA8AQYxD+UKnsdEfo=",
+      "dev": true
+    },
+    "he": {
+      "version": "1.1.1",
+      "resolved": "http://registry.npm.taobao.org/he/download/he-1.1.1.tgz",
+      "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
+      "dev": true
+    },
+    "inflight": {
+      "version": "1.0.6",
+      "resolved": "http://registry.npm.taobao.org/inflight/download/inflight-1.0.6.tgz",
+      "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
+      "dev": true,
+      "requires": {
+        "once": "^1.3.0",
+        "wrappy": "1"
+      }
+    },
+    "inherits": {
+      "version": "2.0.3",
+      "resolved": "http://registry.npm.taobao.org/inherits/download/inherits-2.0.3.tgz",
+      "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
+      "dev": true
+    },
+    "json3": {
+      "version": "3.3.2",
+      "resolved": "http://registry.npm.taobao.org/json3/download/json3-3.3.2.tgz",
+      "integrity": "sha1-PAQ0dD35Pi9cQq7nsZvLSDV19OE=",
+      "dev": true
+    },
+    "lodash._baseassign": {
+      "version": "3.2.0",
+      "resolved": "http://registry.npm.taobao.org/lodash._baseassign/download/lodash._baseassign-3.2.0.tgz",
+      "integrity": "sha1-jDigmVAPIVrQnlnxci/QxSv+Ck4=",
+      "dev": true,
+      "requires": {
+        "lodash._basecopy": "^3.0.0",
+        "lodash.keys": "^3.0.0"
+      }
+    },
+    "lodash._basecopy": {
+      "version": "3.0.1",
+      "resolved": "http://registry.npm.taobao.org/lodash._basecopy/download/lodash._basecopy-3.0.1.tgz",
+      "integrity": "sha1-jaDmqHbPNEwK2KVIghEd08XHyjY=",
+      "dev": true
+    },
+    "lodash._basecreate": {
+      "version": "3.0.3",
+      "resolved": "http://registry.npm.taobao.org/lodash._basecreate/download/lodash._basecreate-3.0.3.tgz",
+      "integrity": "sha1-G8ZhYU2qf8MRt9A78WgGoCE8+CE=",
+      "dev": true
+    },
+    "lodash._getnative": {
+      "version": "3.9.1",
+      "resolved": "http://registry.npm.taobao.org/lodash._getnative/download/lodash._getnative-3.9.1.tgz",
+      "integrity": "sha1-VwvH3t5G1hzc3mh9ZdPuy6o6r/U=",
+      "dev": true
+    },
+    "lodash._isiterateecall": {
+      "version": "3.0.9",
+      "resolved": "http://registry.npm.taobao.org/lodash._isiterateecall/download/lodash._isiterateecall-3.0.9.tgz",
+      "integrity": "sha1-UgOte6Ql+uhCRg5pbbnPPmqsBXw=",
+      "dev": true
+    },
+    "lodash.create": {
+      "version": "3.1.1",
+      "resolved": "http://registry.npm.taobao.org/lodash.create/download/lodash.create-3.1.1.tgz",
+      "integrity": "sha1-1/KEnw29p+BGgruM1yqwIkYd6+c=",
+      "dev": true,
+      "requires": {
+        "lodash._baseassign": "^3.0.0",
+        "lodash._basecreate": "^3.0.0",
+        "lodash._isiterateecall": "^3.0.0"
+      }
+    },
+    "lodash.isarguments": {
+      "version": "3.1.0",
+      "resolved": "http://registry.npm.taobao.org/lodash.isarguments/download/lodash.isarguments-3.1.0.tgz",
+      "integrity": "sha1-L1c9hcaiQon/AGY7SRwdM4/zRYo=",
+      "dev": true
+    },
+    "lodash.isarray": {
+      "version": "3.0.4",
+      "resolved": "http://registry.npm.taobao.org/lodash.isarray/download/lodash.isarray-3.0.4.tgz",
+      "integrity": "sha1-eeTriMNqgSKvhvhEqpvNhRtfu1U=",
+      "dev": true
+    },
+    "lodash.keys": {
+      "version": "3.1.2",
+      "resolved": "http://registry.npm.taobao.org/lodash.keys/download/lodash.keys-3.1.2.tgz",
+      "integrity": "sha1-TbwEcrFWvlCgsoaFXRvQsMZWCYo=",
+      "dev": true,
+      "requires": {
+        "lodash._getnative": "^3.0.0",
+        "lodash.isarguments": "^3.0.0",
+        "lodash.isarray": "^3.0.0"
+      }
+    },
+    "marked": {
+      "version": "0.3.19",
+      "resolved": "http://registry.npm.taobao.org/marked/download/marked-0.3.19.tgz",
+      "integrity": "sha1-XUf3CcTJ/Dwha21GEnKA9As515A=",
+      "dev": true
+    },
+    "minimatch": {
+      "version": "3.0.4",
+      "resolved": "http://registry.npm.taobao.org/minimatch/download/minimatch-3.0.4.tgz",
+      "integrity": "sha1-UWbihkV/AzBgZL5Ul+jbsMPTIIM=",
+      "dev": true,
+      "requires": {
+        "brace-expansion": "^1.1.7"
+      }
+    },
+    "minimist": {
+      "version": "0.0.8",
+      "resolved": "http://registry.npm.taobao.org/minimist/download/minimist-0.0.8.tgz",
+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
+      "dev": true
+    },
+    "mkdirp": {
+      "version": "0.5.1",
+      "resolved": "http://registry.npm.taobao.org/mkdirp/download/mkdirp-0.5.1.tgz",
+      "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
+      "dev": true,
+      "requires": {
+        "minimist": "0.0.8"
+      }
+    },
+    "mocha": {
+      "version": "3.5.3",
+      "resolved": "http://registry.npm.taobao.org/mocha/download/mocha-3.5.3.tgz",
+      "integrity": "sha1-HgSA/jbS2lhY0etqzDhBiybqog0=",
+      "dev": true,
+      "requires": {
+        "browser-stdout": "1.3.0",
+        "commander": "2.9.0",
+        "debug": "2.6.8",
+        "diff": "3.2.0",
+        "escape-string-regexp": "1.0.5",
+        "glob": "7.1.1",
+        "growl": "1.9.2",
+        "he": "1.1.1",
+        "json3": "3.3.2",
+        "lodash.create": "3.1.1",
+        "mkdirp": "0.5.1",
+        "supports-color": "3.1.2"
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "http://registry.npm.taobao.org/ms/download/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "dev": true
+    },
+    "once": {
+      "version": "1.4.0",
+      "resolved": "http://registry.npm.taobao.org/once/download/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
+      "requires": {
+        "wrappy": "1"
+      }
+    },
+    "path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "http://registry.npm.taobao.org/path-is-absolute/download/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+      "dev": true
+    },
+    "supports-color": {
+      "version": "3.1.2",
+      "resolved": "http://registry.npm.taobao.org/supports-color/download/supports-color-3.1.2.tgz",
+      "integrity": "sha1-cqJiiU2dQIuVbKBf83su2KbiotU=",
+      "dev": true,
+      "requires": {
+        "has-flag": "^1.0.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "http://registry.npm.taobao.org/wrappy/download/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    }
+  }
+}
diff --git a/test/test.js b/test/test.js
index 0bcfdc7..b1f6048 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,94 +1,94 @@
 const assert = require('assert')
 
 describe('regex', function () {
-  it('可以捕获正整数 x 的值', function () {
-    const f = require('../lib/capture')
+    it('可以捕获正整数 x 的值', function () {
+        const f = require('../lib/capture')
 
-    assert.equal(f('x=5'), '5', 'x=5')
-    assert.equal(f('abc x=5'), '5', 'abc x=5')
-    assert.equal(f('x=abc'), null, 'x=abc')
-    assert.equal(f('beep x=123123 boop'), '123123', 'beep x=123123 boop')
-  })
+        assert.equal(f('x=5'), '5', 'x=5')
+        assert.equal(f('abc x=5'), '5', 'abc x=5')
+        assert.equal(f('x=abc'), null, 'x=abc')
+        assert.equal(f('beep x=123123 boop'), '123123', 'beep x=123123 boop')
+    })
 
-  it('可以捕获正整数 x 的值，末尾带有 x 的变量不应当被捕获', function () {
-    const f = require('../lib/capture_breakword')
+    it('可以捕获正整数 x 的值，末尾带有 x 的变量不应当被捕获', function () {
+        const f = require('../lib/capture_breakword')
 
-    assert.equal(f('x=5'), '5', 'x=5')
-    assert.equal(f('abc x=5'), '5', 'abc x=5')
-    assert.equal(f('fox=123'), null, 'fox=123')
-    assert.equal(f('x=abc'), null, 'x=abc')
-    assert.equal(f('x=33qrs'), null, 'x=33qrs')
-    assert.equal(f('3x=33'), null, '3x=33')
-    assert.equal(f('beep x=123123 boop'), '123123', 'beep x=123123 boop')
-  })
+        assert.equal(f('x=5'), '5', 'x=5')
+        assert.equal(f('abc x=5'), '5', 'abc x=5')
+        assert.equal(f('fox=123'), null, 'fox=123')
+        assert.equal(f('x=abc'), null, 'x=abc')
+        assert.equal(f('x=33qrs'), null, 'x=33qrs')
+        assert.equal(f('3x=33'), null, '3x=33')
+        assert.equal(f('beep x=123123 boop'), '123123', 'beep x=123123 boop')
+    })
 
-  it(`匹配8位 hex 代码，以'0x'开头，后面跟着两个字符可以是大写'A-F'，小写'a-f'，或者任意数字`, function () {
-    const f = require('../lib/quantified_group')
+    it(`匹配8位 hex 代码，以'0x'开头，后面跟着两个字符可以是大写'A-F'，小写'a-f'，或者任意数字`, function () {
+        const f = require('../lib/quantified_group')
 
-    assert.ok(
-      f('0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF\n'),
-      '0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF\\n'
-    )
-    assert.ok(
-      f('0x00\n0x11\n0x22\n0x33\n0x44\n0x55\n0x66\n0x77\n'),
-      '0x00\\n0x11\\n0x22\\n0x33\\n0x44\\n0x55\\n0x66\\n0x77'
-    )
-    assert.ok(
-      f('0x0f  0x1f  0x2f  0x3f  0x4f  0x5f  0x6f  0x7f\n'),
-      '0x0f  0x1f  0x2f  0x3f  0x4f  0x5f  0x6f  0x7f\\n'
-    )
-    assert.ok(
-      f('0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0x7F\n'),
-      '0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0x7F\\n'
-    )
-    assert.ok(
-      !f('0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F\n'),
-      '0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F\n'
-    )
-    assert.ok(
-      !f('0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0xff 0xff\n'),
-      '0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0xff 0xff\n'
-    )
-  })
+        assert.ok(
+            f('0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF\n'),
+            '0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF\\n'
+        )
+        assert.ok(
+            f('0x00\n0x11\n0x22\n0x33\n0x44\n0x55\n0x66\n0x77\n'),
+            '0x00\\n0x11\\n0x22\\n0x33\\n0x44\\n0x55\\n0x66\\n0x77'
+        )
+        assert.ok(
+            f('0x0f  0x1f  0x2f  0x3f  0x4f  0x5f  0x6f  0x7f\n'),
+            '0x0f  0x1f  0x2f  0x3f  0x4f  0x5f  0x6f  0x7f\\n'
+        )
+        assert.ok(
+            f('0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0x7F\n'),
+            '0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0x7F\\n'
+        )
+        assert.ok(
+            !f('0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F\n'),
+            '0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F\n'
+        )
+        assert.ok(
+            !f('0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0xff 0xff\n'),
+            '0xE2 0xC3 0xB3 0xD0 0x44 0x9E 0x6F 0xff 0xff\n'
+        )
+    })
 
-  it('匹配所有引号', function () {
-    const f = require('../lib/quotes')
-    assert.deepEqual(
-      f('one "two three four" five six "seven eight" nine'),
-      ['"two three four"','"seven eight"'],
-      'one "two three four" five six "seven eight" nine'
-    )
-    assert.deepEqual(
-      f('"beep boop" whatever "tacos" eleven "eighty"'),
-      ['"beep boop"','"tacos"','"eighty"'],
-      '"beep boop" whatever "tacos" eleven "eighty"'
-    )
-    assert.deepEqual(f('empty ""'), ['""'], 'empty ""')
-  })
+    it('匹配所有引号', function () {
+        const f = require('../lib/quotes')
+        assert.deepEqual(
+            f('one "two three four" five six "seven eight" nine'),
+            ['"two three four"','"seven eight"'],
+            'one "two three four" five six "seven eight" nine'
+        )
+        assert.deepEqual(
+            f('"beep boop" whatever "tacos" eleven "eighty"'),
+            ['"beep boop"','"tacos"','"eighty"'],
+            '"beep boop" whatever "tacos" eleven "eighty"'
+        )
+        assert.deepEqual(f('empty ""'), ['""'], 'empty ""')
+    })
 
-  it(`将'@@...@@'markdown语法变成'<blink>...</blink>'`, function () {
-    const f = require('../lib/blink')
-    
-    assert.equal(
-      f('@@whatever@@').trim(),
-      '<p><blink>whatever</blink></p>',
-      '@@whatever@@'
-    )
-    assert.equal(
-      f('*abc* @@def@@ __ghi__').trim(),
-      '<p><em>abc</em> <blink>def</blink> <strong>ghi</strong></p>',
-      '*abc* @@def@@ __ghi__'
-    )
-    assert.equal(
-      f('@@**cool**@@').trim(),
-      '<p><blink><strong>cool</strong></blink></p>',
-      '@@**cool**@@'
-    )
-    assert.equal(
-      f('beep @@boop@@ says *the* @@**robot**@@!').trim(),
-      '<p>beep <blink>boop</blink> says <em>the</em>'
-        + ' <blink><strong>robot</strong></blink>!</p>',
-      'beep @@boop@@ says *the* @@**robot**@@!'
-    )
-  })
+    it(`将'@@...@@'markdown语法变成'<blink>...</blink>'`, function () {
+        const f = require('../lib/blink')
+
+        assert.equal(
+            f('@@whatever@@').trim(),
+            '<p><blink>whatever</blink></p>',
+            '@@whatever@@'
+        )
+        assert.equal(
+            f('*abc* @@def@@ __ghi__').trim(),
+            '<p><em>abc</em> <blink>def</blink> <strong>ghi</strong></p>',
+            '*abc* @@def@@ __ghi__'
+        )
+        assert.equal(
+            f('@@**cool**@@').trim(),
+            '<p><blink><strong>cool</strong></blink></p>',
+            '@@**cool**@@'
+        )
+        assert.equal(
+            f('beep @@boop@@ says *the* @@**robot**@@!').trim(),
+            '<p>beep <blink>boop</blink> says <em>the</em>'
+            + ' <blink><strong>robot</strong></blink>!</p>',
+            'beep @@boop@@ says *the* @@**robot**@@!'
+        )
+    })
 })
\ No newline at end of file