implement skipTags method

README.md

@@ -96,6 +96,25 @@ var_dump(
 );
 ```
 
+#### Body::skipTags
+
+Strip gemini tags from Gemini document
+
+```
+var_dump(
+    $body->skipTags() // strip all tags
+);
+
+var_dump(
+    $body->skipTags(
+        [ // 1- and 2- level headers only
+            "##",
+            "###"
+        ]
+    )
+);
+```
+
 ### Link
 
 Inline links parser.

src/Gemtext/Body.php

@@ -105,4 +105,89 @@ class Body
 
         return $matches;
     }
+
+    public function skipTags(array $tags = []): string
+    {
+        $lines = [];
+
+        foreach ($this->_lines as $line)
+        {
+            $line = trim(
+                $line
+            );
+
+            if ($tags)
+            {
+                foreach ($tags as $tag)
+                {
+                    if(!in_array($tag, ['#', '##', '###', '=>', '*', '```']))
+                    {
+                        continue;
+                    }
+
+                    switch (true)
+                    {
+                        case str_starts_with($line, '#'):
+
+                            $line = preg_replace(
+                                sprintf(
+                                    '/^%s([^#]+)/ui',
+                                    $tag
+                                ),
+                                '$1',
+                                $line
+                            );
+
+                        break;
+
+                        case str_starts_with($line, '*'):
+
+                            $line = preg_replace(
+                                '/^\*(.*)/ui',
+                                '$1',
+                                $line
+                            );
+
+                        break;
+
+                        default:
+
+                            $line = preg_replace(
+                                sprintf(
+                                    '/^%s(.*)/ui',
+                                    $tag
+                                ),
+                                '$1',
+                                $line
+                            );
+                    }
+                }
+            }
+
+            else
+            {
+                $line = preg_replace(
+                    [
+                        '/^#([^#]+)/ui',
+                        '/^##([^#]+)/ui',
+                        '/^###([^#]+)/ui',
+                        '/^=>(.*)/ui',
+                        '/^\*(.*)/ui',
+                        '/^```(.*)/ui',
+                    ],
+                    '$1',
+                    $line
+                );
+            }
+
+            $lines[] = trim(
+                $line
+            );
+        }
+
+        return implode(
+            PHP_EOL,
+            $lines
+        );
+    }
 }