Add (initial): futurewalker code

app/Helpers/Global/string_helper.php

@@ -3,6 +3,24 @@
 use GrahamCampbell\Markdown\Facades\Markdown;
 use Illuminate\Support\Str;
 
+if (! function_exists('is_valid_url')) {
+    function is_valid_url($url)
+    {
+        // Check if the URL is a valid full URL
+        if (filter_var($url, FILTER_VALIDATE_URL)) {
+            return true;
+        }
+
+        // Check if it's a valid relative URL
+        // Modify this regex as needed for your specific URL formats
+        if (preg_match('/^\/[\w\/_.-]+(\.[\w]+)?$/i', $url)) {
+            return true;
+        }
+
+        return false;
+    }
+}
+
 if (! function_exists('epoch_now_timestamp')) {
     function epoch_now_timestamp()
     {
@@ -17,6 +35,14 @@ function read_duration($text)
     }
 }
 
+if (! function_exists('remove_newline')) {
+
+    function remove_newline($string)
+    {
+        return preg_replace('/\s+/', ' ', trim($string));
+    }
+}
+
 if (! function_exists('plain_text')) {
     function plain_text($content)
     {
@@ -24,6 +50,32 @@ function plain_text($content)
     }
 }
 
+if (! function_exists('markdown_to_plaintext')) {
+    function markdown_to_plaintext($markdown)
+    {
+        // Headers
+        $markdown = preg_replace('/^#.*$/m', '', $markdown);
+        // Links and images
+        $markdown = preg_replace('/\[(.*?)\]\(.*?\)/', '$1', $markdown);
+        // Bold and italic
+        $markdown = str_replace(['**', '__', '*', '_'], '', $markdown);
+        // Ordered and unordered lists
+        $markdown = preg_replace('/^[-\*].*$/m', '', $markdown);
+        // Horizontal line
+        $markdown = str_replace(['---', '***', '- - -', '* * *'], '', $markdown);
+        // Inline code and code blocks
+        $markdown = preg_replace('/`.*?`/', '', $markdown);
+        $markdown = preg_replace('/```[\s\S]*?```/', '', $markdown);
+        // Blockquotes
+        $markdown = preg_replace('/^>.*$/m', '', $markdown);
+
+        // Remove multiple spaces, leading and trailing spaces
+        $plaintext = trim(preg_replace('/\s+/', ' ', $markdown));
+
+        return $plaintext;
+    }
+}
+
 if (! function_exists('markdown_min_read')) {
     function markdown_min_read($markdown)
     {
@@ -48,12 +100,12 @@ function str_slug($string, $delimiter = '-')
 if (! function_exists('str_first_sentence')) {
     function str_first_sentence($str)
     {
-        // Split the string at ., !, or ?
-        $sentences = preg_split('/(\.|!|\?)(\s|$)/', $str, 2);
+        // Split the string at ., !, or ? but include these characters in the match
+        $sentences = preg_split('/([.!?])\s/', $str, 2, PREG_SPLIT_DELIM_CAPTURE);
 
-        // Return the first part of the array if available
-        if (isset($sentences[0])) {
-            return trim($sentences[0]);
+        // Check if we have captured the first sentence and its punctuation
+        if (isset($sentences[0]) && isset($sentences[1])) {
+            return trim($sentences[0].$sentences[1]);
         }
 
         // If no sentence ending found, return the whole string