user/regex-backslash.sh

   1 #!/usr/bin/env bash
   2 # Desc: Backslashes regex special characters
   3 # Usage: cat file.txt | regex-backslash.sh
   4 # Version: 0.0.1
   5 # Depends: sed (GNU sed) 4.8; GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu)
   6 # Ref/Attrib: [1] TIL: Reading stdin to a BASH variable https://dev.to/jeremyckahn/til-reading-stdin-to-a-bash-variable-1kln
   7
   8 STD_IN=$(</dev/stdin);
   9
  10 printf "%s\n" "$STD_IN" | \
  11     sed \
  12         -e 's/\\/\\\\/g'  \
  13         -e 's/\./\\./g'   \
  14         -e 's/\+/\\+/g'   \
  15         -e 's/\*/\\*/g'   \
  16         -e 's/\?/\\?/g'   \
  17         -e 's/\^/\\^/g'   \
  18         -e 's/\$/\\$/g'   \
  19         -e 's/(/\\(/g'    \
  20         -e 's/)/\\)/g'    \
  21         -e 's/\[/\\[/g'   \
  22         -e 's/\]/\\]/g'   \
  23         -e 's/{/\\{/g'    \
  24         -e 's/}/\\}/g'    \
  25         -e 's/|/\\|/g'    \
  26         -- -;
  27
  28 exit 0;
  29
  30 # Author: Steven Baltakatei Sandoval
  31 # License: GPLv3+