feat(user/regex-backslash.sh):Add script to escape regex chars

diff --git a/user/regex-backslash.sh b/user/regex-backslash.sh
new file mode 100755 (executable)
index 0000000..3a850d6
--- /dev/null
+++ b/user/regex-backslash.sh
@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Desc: Backslashes regex special characters
+# Usage: cat file.txt | regex-backslash.sh
+# Version: 0.0.1
+# Depends: sed (GNU sed) 4.8; GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
+# Ref/Attrib: [1] TIL: Reading stdin to a BASH variable https://dev.to/jeremyckahn/til-reading-stdin-to-a-bash-variable-1kln
+
+STD_IN=$(</dev/stdin);
+
+printf "%s\n" "$STD_IN" | \
+    sed \
+        -e 's/\\/\\\\/g'  \
+        -e 's/\./\\./g'   \
+        -e 's/\+/\\+/g'   \
+        -e 's/\*/\\*/g'   \
+        -e 's/\?/\\?/g'   \
+        -e 's/\^/\\^/g'   \
+        -e 's/\$/\\$/g'   \
+        -e 's/(/\\(/g'    \
+        -e 's/)/\\)/g'    \
+        -e 's/\[/\\[/g'   \
+        -e 's/\]/\\]/g'   \
+        -e 's/{/\\{/g'    \
+        -e 's/}/\\}/g'    \
+        -e 's/|/\\|/g'    \
+        -- -;
+
+exit 0;
+
+# Author: Steven Baltakatei Sandoval
+# License: GPLv3+