Filtering a diff with a regular expression

by 
$ git diff --help

-G<regex>
    Look for differences whose added or removed line matches the given <regex>.

EDIT:

After some tests I’ve got something like

git diff -b -w --word-diff-regex='.*\[[^"]*\]'

Then I’ve got output like:

diff --git a/test.php b/test.php
index 62a2de0..b76891f 100644
--- a/test.php
+++ b/test.php
@@ -1,3 +1,5 @@
<?php

{+$my_array[my_key]+} = "test";

?>
diff --git a/test1.php b/test1.php
index 62a2de0..6102fed 100644
--- a/test1.php
+++ b/test1.php
@@ -1,3 +1,5 @@
<?php

some_other_stuff();

?>

Maybe it will help you. I found it here http://www.rhinocerus.net/forum/lang-lisp/659593-git-word-diff-regex-lisp-source.html and there is more information on this thread

EDIT2:

git diff -G'\[[A-Za-z_]*\]' --pickaxe-regex

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