regex to replace a pattern

Question

I am using sed in linux. I have done most of the job but need help in this: a part of the pattern is like these:

document=SomeRanddomAlphaNumeric/10DigitNumber, user=

some examples:

I am expecting to find:

ducument=LKJHuasfb89/9878476578, user=
ducument=jhdn uryhf 9adu/6767898893, user=
ducument=iujjnbmr Ohndj88isju/6767898734, user=

and turn them to:

ducument=replacetext, user=
ducument=replacetext, user=
ducument=replacetext, user=

I am using this as sed command :

$ sed -i 's/regex/replacetext/g' $file.txt

replace text is constant but I need the regex for above command.

no they are pattern I want to replace them. I will update the q — Alireza
– Alireza, Commented Aug 21, 2013 at 6:28

Thor · Accepted Answer · 2013-08-21 06:33:24Z

1

If the preceding text does not contain any slash characters (/), you can match the 10 digit sequence like this:

sed 's|\(ducument=[^/]*/\)[0-9]\{10\}|\1replacetext|' infile

answered Aug 21, 2013 at 6:33

Thor

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2 Comments

Alireza Over a year ago

uh, thanks! does this command works for multiple occurances of same string in the input file?

Thor Over a year ago

@Youhan: if they are on the same line then yes, otherwise you need to add the g flag the the sed command.

Shiplu Mokaddim · Accepted Answer · 2013-08-21 06:38:16Z

1

This would work,

sed  's/\(ducument=\)\([^,]\+\)/\1replacetext/g'  file

answered Aug 21, 2013 at 6:38

Shiplu Mokaddim

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Comments

Shiplu Mokaddim · Accepted Answer · 2013-08-21 06:39:03Z

1

This sed should work:

sed -i.bak 's/^\(document=\)[^,]*/\1replacetext/' file

edited Aug 21, 2013 at 6:39

Shiplu Mokaddim

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answered Aug 21, 2013 at 6:33

anubhava

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