How to replace all email addresses in a set of files with a generic email address

sed replace all
sed replace line
sed replace character

I have some scripts which have many email address in different domain (say, . I want to replace all of them with some generic email address in a common domain, say, keeping rest of the script same.

I am using below in sed but it doesn't seem to work. (it is returning same output as input, so looks like the search is not matching. However, when I tested the regex \S+@\S+/ in online tester, it seems to match email addresses.)


For example, I have 2 scripts

$ cat
export SENDFROM="" blah_4

$ cat
echo foo|mailx -s "blah",,
foo bar

My result after sed -i should be

$ cat
export SENDFROM="" blah_4

$ cat
echo foo|mailx -s "blah",,
foo bar

I am using Linux 3.10.0-327.28.2.el7.x86_64

Any suggestion please?

Update: I managed to make it work with 's/\S\+@\S\'. There were 2 problem with previous search.

  • The + needed \ before it.
  • As file had other @ lines (for database connections), I had to append .com at the end, as all my addresses ended in .com

UPDATE - Other answers, and comments on this one, point out that you may have to take extra steps to enable shorthand character class matching; I'm used to doing regex in perl, where this just works, so didn't think to address that possibility. This answer only addresses how to improve the matching once you have the regex functioning.


While the problem of matching email addresses with regex can be very complex (and in fact in the most general case isn't possible with true regex), you probably can handle your specific case.

The problem with what you have is that \S matches any non-whitespace, so,, where two addresses have no whitespace between, matches incorrectly.

So there's a couple ways to go about it, based on knowing what sorts of addresses you realistically will see. One solution would be to replace both instances of \S with [^\s,] (note the lowercase s), which simply excludes , from the match as well as whitespace.

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Capturing email adresses using regex can be more difficult than it seems. Anyhow, for replacing the domain, I think you could simplistically consider that an email domain starts when it find:

1 alphanum char + @ + N alphanum chars + . + N alphanum chars

Based on this preconception, in javascript I would do so:


Replacing with:


Hope it helps you.

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Try this

sed s/[^,@]*@[^,]*/


echo ',,' | sed s/[^,@]*@[^,]*/


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Still UNIX-related, though requiring the more modern and far from ubiquitous tool, Ammonite, you could use email-replace.

$ amm path/to/ <random integer seed> <file1 with emails> <file2 with emails> ...

DISCLAIMER: the matcher is likely far from perfect, so use at your own risk, and always have backups available. Note that by default it replaces emails with a new random e-mail address. To use a fixed email address, just replace the call to randEmail with a constant string.

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Whitelist Email Addresses in an Email Client or Security Program, Select "Customize Mail Controls for this Screen Name" and click Next. (Optional) Select "Allow email from all AOL members, email addresses  4. Locate the person on the addresses list you wish to remove, tap it to highlight the person and then tap the “Delete” button: 5. Tap “Yes” to confirm the deletion. The position where this person was will now be free to add someone else.

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