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Full Discussion: Replace Pattern with another that has Special Characters
Top Forums UNIX for Beginners Questions & Answers Replace Pattern with another that has Special Characters Post 303033344 by RudiC on Wednesday 3rd of April 2019 04:52:58 PM
Old 04-03-2019
You are quite free in selecting delimiters for sed's s command:
info sed:
Quote:
The '/' characters may be uniformly replaced by any other single character within any given 's' command. The '/' character (or whatever other character is used in its stead) can appear in the REGEXP or REPLACEMENT only if it is preceded by a '\' character.
so the / don't need to be escaped any more.



But, as apmcd47 already pointed out, you need to make sure that the selected delimiter doesn't show up explicitly in your regex nor replacement, nor does any character with a special meaning in regexes, like the ones you mentioned.
For single special chars, you might fall back to your shell's "Parameter Expansion / Pattern substitution" as alluded to by apmcd47, so your command would look like

Code:
sed "s^<urn:sourceKey>${old_pkey//[/\\[}</urn:sourceKey>^<urn:sourceKey>${new_pkey//[/\\[}</urn:sourceKey>^g" delete_request.txt

If you expect more than one special char, it might be easier to create a small sed command on the fly, using another sed invocation.
 

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LEARN ABOUT PHP

mb_eregi_replace

MB_EREGI_REPLACE(3)							 1						       MB_EREGI_REPLACE(3)

mb_eregi_replace - Replace regular expression with multibyte support ignoring case

SYNOPSIS

       string mb_eregi_replace (string	$pattern, string  $replace, string  $string, [string  $option = "msri"])

DESCRIPTION

	Scans $string for matches to $pattern, then replaces the matched text with $replacement.

PARAMETERS

	      o $pattern
		- The regular expression pattern. Multibyte characters may be used. The case will be ignored.

	      o $replace
		- The replacement text.

	      o $string
		- The searched string.

	      o $option
		-$option has the same meaning as in mb_ereg_replace(3).

RETURN VALUES

	The resultant string or FALSE on error.

NOTES

       Note

	      The  internal  encoding  or the character encoding specified by mb_regex_encoding(3) will be used as the character encoding for this
	      function.

       Warning

	      Never use the e modifier when working on untrusted input. No automatic escaping will happen (as  known  from  preg_replace(3)).  Not
	      taking care of this will most likely create remote code execution vulnerabilities in your application.

SEE ALSO

       mb_regex_encoding(3), mb_ereg_replace(3).

PHP Documentation Group 												       MB_EREGI_REPLACE(3)
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