X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FUtil%2FStrings.php;h=88dd1d39f81edd151151dac1ba6b7449528dd871;hb=a61ce4fed0eba0c1cee3b96e81be6fa89e96c9f9;hp=55751d8d8274a901fca6a76b75171a89e886a1e7;hpb=b06fc578804fdc0073631e7c97eccd25543e769e;p=friendica.git

diff --git a/src/Util/Strings.php b/src/Util/Strings.php
index 55751d8d82..88dd1d39f8 100644
--- a/src/Util/Strings.php
+++ b/src/Util/Strings.php
@@ -31,6 +31,18 @@ class Strings
         return $return;
     }
 
+	/**
+	 * Checks, if the given string is a valid hexadecimal code
+	 *
+	 * @param string $hexCode
+	 *
+	 * @return bool
+	 */
+    public static function isHex($hexCode)
+    {
+	    return !empty($hexCode) ? @preg_match("/^[a-f0-9]{2,}$/i", $hexCode) && !(strlen($hexCode) & 1) : false;
+    }
+
     /**
      * @brief This is our primary input filter.
      *
@@ -346,4 +358,49 @@ class Strings
 
 		return $return;
 	}
+
+	/**
+	 * Returns the regular expression string to match URLs in a given text
+	 *
+	 * @return string
+	 * @see https://daringfireball.net/2010/07/improved_regex_for_matching_urls
+	 */
+	public static function autoLinkRegEx()
+	{
+		return '@
+(?<![=\'\]"/])          # Not preceded by [, =, \', ], ", /
+\b
+(                              # Capture 1: entire matched URL
+  https?://                            # http or https protocol
+  (?:
+    [^/\s\xA0`!()\[\]{};:\'",<>?«»“”‘’.]    # Domain can\'t start with a . 
+    [^/\s\xA0`!()\[\]{};:\'",<>?«»“”‘’]+    # Domain can\'t end with a .
+    \.
+    [^/\s\xA0`!()\[\]{};:\'".,<>?«»“”‘’]+/? # Followed by a slash
+  )
+  (?:                                  # One or more:
+    [^\s\xA0()<>]+                         # Run of non-space, non-()<>
+    |                                  #   or
+    \(([^\s\xA0()<>]+|(\([^\s()<>]+\)))*\) # balanced parens, up to 2 levels
+    |                                  #   or
+    [^\s\xA0`!()\[\]{};:\'".,<>?«»“”‘’]    # not a space or one of these punct chars
+  )*
+)@xiu';
+	}
+
+	/**
+	 * Ensures a single path item doesn't contain any path-traversing characters
+	 *
+	 * @see https://stackoverflow.com/a/46097713
+	 * @param string $pathItem
+	 * @return string
+	 */
+	public static function sanitizeFilePathItem($pathItem)
+	{
+		$pathItem = str_replace('/', '_', $pathItem);
+		$pathItem = str_replace('\\', '_', $pathItem);
+		$pathItem = str_replace(DIRECTORY_SEPARATOR, '_', $pathItem); // In case it does not equal the standard values
+
+		return $pathItem;
+	}
 }