Update README.md

README.md

@@ -27,15 +27,34 @@ This will catch all the 3 cases above since the neutral php whitespaces are igno
 
 -------------------
 
-### Keywords:
-
-- '\<white_space\>'
-- '\<until\>'
-- '\<in_between\>'
-- '\<comment\>'
-- '\<variable\>' or '\<var\>'
-- '\<string\>' or '\<str\>'
-- '\<any\>'
+#### Placeholders:
+
+Here is a copmerehensive list of placeholders you can use:
+
+- `"<var>"` or `"<variable>"`: for variables like: `$user`
+- `"<str>"` or `"<string>"`: for hard coded strings: `'hello'` or "hello"
+- `"<class_ref>"`: for class references:  `\App\User::where(...` , `User::where`
+- `"<full_class_ref>"`: only for full references:  `\App\User::`
+- `"<until>"`: to capture all the code until you reach a certain character.
+- `"<comment>"`: for commands (does not capture doc-blocks)
+- `"<doc_block>"`: for doc-blocks
+- `"<statement>"`: to capture a whole php statement.
+- `"<name:nam1,nam2>"` or `"<name>"`: for method or function names. `->where` or `::where`
+- `"<white_space>"`: for whitespace blocks
+- `"<bool>"` or `'<boolean>'`: for true or false (acts case-insensetive)
+- `"<number>"`: for numeric values
+- `"<cast>"`: for type-casts like: `(array) $a;`
+- `"<int>"` or `"<integer>"`: for integer values
+- `"<visibility>"`: for public, protected, private
+- `"<float>"`: for floating point number
+- `"<global_func_call:func1,func2>"`: to detect global function calls.
+- `"<in_between>"`: to capture code within a pair of  `{...}` or `(...)` or `[...]`
+- `"<any>"`: captures any token.
+- **You can also define your own keywords if needed!**
+
+You just define a class for your new keyword and append the class path to the end of `Finder::$keywords[] = MyKeyword::class` property.
+Just like the default keywords.
+
 
 ### Example:
 lets say you want to remove the optional comma from arrays: