From 565334c069c7639c6f1e14f0897d09279e49a0c8 Mon Sep 17 00:00:00 2001
From: tomaski <tomaski@wix.com>
Date: Tue, 27 Jun 2023 10:10:10 +0300
Subject: [PATCH 1/4] Add `preserve` option to allow preserving additional
 characters in strict mode

---
 slugify.d.ts | 1 +
 slugify.js   | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/slugify.d.ts b/slugify.d.ts
index e20f795..773e005 100644
--- a/slugify.d.ts
+++ b/slugify.d.ts
@@ -16,6 +16,7 @@ declare function slugify(
         strict?: boolean;
         locale?: string;
         trim?: boolean;
+        preserve?: string[];
       }
     | string,
 
diff --git a/slugify.js b/slugify.js
index f5a6a1e..041c6a5 100644
--- a/slugify.js
+++ b/slugify.js
@@ -43,7 +43,9 @@
       }, '');
 
     if (options.strict) {
-      slug = slug.replace(/[^A-Za-z0-9\s]/g, '');
+      const preserveCharacters = options.preserve ? `\\${options.preserve.join('\\')}` : '';
+      const regex = new RegExp(`[^A-Za-z0-9${preserveCharacters}\\s]`, 'g');
+      slug = slug.replace(regex, '');
     }
 
     if (trim) {

From cebda42a64cb0fc088ec350df255462afb158aa3 Mon Sep 17 00:00:00 2001
From: tomaski <tomaski@wix.com>
Date: Tue, 27 Jun 2023 10:21:16 +0300
Subject: [PATCH 2/4] Add a test for preserve

---
 test/slugify.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/slugify.js b/test/slugify.js
index e2581d2..9740ad3 100644
--- a/test/slugify.js
+++ b/test/slugify.js
@@ -76,6 +76,14 @@ describe('slugify', () => {
     t.equal(slugify('foo @ bar', {strict: true}), 'foo-bar')
   })
 
+  it('options.strict, options.preserve and options.replacement', () => {
+    t.equal(slugify('!foo.bar_baz@#~', {
+      replacement: '_',
+      strict: true,
+      preserve: ['.']
+    }), 'foo.bar_baz')
+  })
+
   it('options.replacement and options.strict', () => {
     t.equal(slugify('foo_@_bar-baz!', {
       replacement: '_',

From 80d9d2351860ee24f3256eec5c0776070fbcc0b9 Mon Sep 17 00:00:00 2001
From: tomaski <tomaski@wix.com>
Date: Tue, 27 Jun 2023 11:13:34 +0300
Subject: [PATCH 3/4] Add preserve to non-strict mode

---
 slugify.js      | 12 ++++++++----
 test/slugify.js |  4 ++++
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/slugify.js b/slugify.js
index 041c6a5..a4ca2ce 100644
--- a/slugify.js
+++ b/slugify.js
@@ -30,6 +30,8 @@
 
     var trim = options.trim === undefined ? true : options.trim
 
+    var preserve = options.preserve === undefined ? [] : `\\${options.preserve.join('\\')}`;
+
     var slug = string.normalize().split('')
       // replace characters based on charMap
       .reduce(function (result, ch) {
@@ -37,15 +39,17 @@
         if (appendChar === undefined) appendChar = charMap[ch];
         if (appendChar === undefined) appendChar = ch;
         if (appendChar === replacement) appendChar = ' ';
+
+        const regexp = new RegExp(`[^\\w\\s$*_+~.()'"!\\-:@${preserve}]+`, 'g')
+
         return result + appendChar
           // remove not allowed characters
-          .replace(options.remove || /[^\w\s$*_+~.()'"!\-:@]+/g, '')
+          .replace(options.remove || regexp, '')
       }, '');
 
     if (options.strict) {
-      const preserveCharacters = options.preserve ? `\\${options.preserve.join('\\')}` : '';
-      const regex = new RegExp(`[^A-Za-z0-9${preserveCharacters}\\s]`, 'g');
-      slug = slug.replace(regex, '');
+      const regexp = new RegExp(`[^A-Za-z0-9${preserve}\\s]`, 'g')
+      slug = slug.replace(regexp, '')
     }
 
     if (trim) {
diff --git a/test/slugify.js b/test/slugify.js
index 9740ad3..11f4372 100644
--- a/test/slugify.js
+++ b/test/slugify.js
@@ -68,6 +68,10 @@ describe('slugify', () => {
     t.equal(slugify('Foo bAr baZ', {lower: true}), 'foo-bar-baz')
   })
 
+  it('options.preserve', () => {
+    t.equal(slugify('/url/to/foo bar baz', {preserve: ['/']}), '/url/to/foo-bar-baz')
+  });
+
   it('options.strict', () => {
     t.equal(slugify('foo_bar. -@-baz!', {strict: true}), 'foobar-baz')
   })

From ec94d65ac6fd4da01dac499e444c250770b8104a Mon Sep 17 00:00:00 2001
From: tomaski <tomaski@wix.com>
Date: Tue, 27 Jun 2023 12:41:43 +0300
Subject: [PATCH 4/4] Readme

---
 README.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/README.md b/README.md
index 385d7b0..7197294 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ slugify('some string', {
   strict: false,     // strip special characters except replacement, defaults to `false`
   locale: 'vi',      // language code of the locale to use
   trim: true         // trim leading and trailing replacement chars, defaults to `true`
+  preserve: ['.']    // preserve specified characters in the result
 })
 ```