Search and replace

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# 1  
Old 09-21-2009
Search and replace

I have a file whose contents are something like:


echo Activation Code: $ACTIVATIONCODE

I want to replace the "<number>" in the line "ACTIVATION CODE=<number>" using sed. The <number> changes with different files.
# 2  
Old 09-21-2009
sed -re 's/^(ACTIVATION CODE=)[0-9]+$/\1the_new_number/' /path/to/the/file

# 3  
Old 09-21-2009
MySQL Explanation of the syntax

Can You explain the sysntax used.
# 4  
Old 09-21-2009

s/^(ACTIVATION CODE=)[0-9]+$/\1the_new_number/
  <----- replace this -----> <- with this -->

Advanced match:
|         |          |   +-- End of the line
|         |          +-- One or more digits (the plus sign require the -r switch)
|         +-- Please remember the part between parenthesis (require the -r swith)
+-- Beginning of the line

Warning. Because we specify the begining and end of the line, their can't be anything else than what is mentioned here. I mean, the following line will NOT match the pattern for two reasons: space at the beginning and comment at the end.
   ACTIVATION CODE=345   # Example

Advanced replace:
 |       |
 |       +-- and write the new number
 +-- recall the part between parenthesis

Hope this helps.
# 5  
Old 09-21-2009
MySQL ALNUM instead of NUM

if the entry is like:
i.e <the activation key> can contain alphanumeric characters and a "-" then what should the sed command be?

Kindly help
# 6  
Old 09-21-2009
You mean there is an actual < and > to delimit the code?
And the key can contain lower case, upper case, digits and dashes.
s/^(ACTIVATION CODE=)<[[:alnum:]-]+>$/\1the_new_number/

# 7  
Old 09-21-2009

No there is no < and > to delimit the code.

The line of concern is:

But the activation code(here 3c8de317-36b2) can be alphanumeric with a single "-"(hyphen) inserted anywhere inside.

---------- Post updated at 03:53 AM ---------- Previous update was at 03:46 AM ----------

A few examples of activation code:

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