From 4e1a5fbcb919d22a8674398ae1b71b5eef006603 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bertrand=20N=C3=A9ron?= <bneron@pasteur.fr>
Date: Sun, 4 Sep 2022 15:55:59 +0200
Subject: [PATCH] fix special pattern syntax for grep

---
 source/Unix/search_filter.rst | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/source/Unix/search_filter.rst b/source/Unix/search_filter.rst
index 7290992..bb0825b 100644
--- a/source/Unix/search_filter.rst
+++ b/source/Unix/search_filter.rst
@@ -70,13 +70,13 @@ grep with Regular Expressions
     * **[]** bracket expressions: defines a set of characters
         * *[abc]* : matches character *"a"* or *"b"* or *"c"*
         * *[a-z]* : matches on character in the range from *"a"* to *"z"*, ie *"a"* or *"b"* ... or *"z"*
-        * *[:alnum:]* : matches any letter or numberic characters
-        * *[:alpha:]* : matches any letter
-        * *[:digit:]* : matches any number
-        * *[:lower:]* : matches any letter in range [a-z]
-        * *[:upper:]* : matches any letter in range [A-Z]
-        * *[:punct:]* : matches any punctuation character
-        * *[:space:]* : matches any space character (space, tab, ...)
+        * *[[:alnum:]]* : matches any letter or numberic characters
+        * *[[:alpha:]]* : matches any letter
+        * *[[:digit:]]* : matches any number
+        * *[[:lower:]]* : matches any letter in range [a-z]
+        * *[[:upper:]]* : matches any letter in range [A-Z]
+        * *[[:punct:]]* : matches any punctuation character
+        * *[[:space:]]* : matches any space character (space, tab, ...)
     * Anchoring.
         * **^** represent start of the string.
         * **$** represent end of the string.
-- 
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