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Old 02-09-2007, 08:05 PM   #1
ShaqDiesel
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Registered: Jul 2005
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sed regex question


I am using using the following regex string
regex="letter1.letter1.letter1" in a ksh script. The dots are supposed to be metacharacters that would match any single character.

I was hoping sed -i "s/($regex)/hello$1/g file1 would transform
"letter1 letter1 letter1" to "hello letter1 letter1 letter1" in file1 but it didn't do anything. I'd like to mention that I can't just use a literal in the substitute statement because it isn't always "letter1". What's going on here? Thanks in advance.
 
Old 02-09-2007, 08:24 PM   #2
Tinkster
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Try this:
Code:
[tink:~]$ regex="letter1.letter1.letter1"
[tink:~]$ sed "s/\($regex\)/hello\1/g" file1
helloletter1 letter1aletter1
helloletter1.letter1.letter1
letter1 letter2 letter1
where file1 looks like
Code:
$ cat file1
letter1 letter1aletter1
letter1.letter1.letter1
letter1 letter2 letter1

Cheers,
Tink
 
  


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