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Join 2 separate strings into one with alternate tokens.

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Top Forums Shell Programming and Scripting Join 2 separate strings into one with alternate tokens.
# 29  
Old 07-06-2011
basically it transform whatever1:whatever2 into whatever2:whatever1

It switches 2 columns that are separated with colon but in details ...

sed 's/RE/PATTERN/'|replace the first found regular expression 'RE' with the pattern 'PATTERN'


^the line start with
\(beginning of the description of a regular expression that can be back referenced later as \1
[start defininf a list of element
^negation of the list
:element
]end of list of possible element
*previous definition repeated 0 or more times
\)End of the regular expression to which we can later refer as \1
:colon (taken litterally)
\(beginning of the description of a regular expression that can be back referenced later as \2
[^:]*any character that is NOT a colon repeated 0 or more times
\)End of the regular expression to which we can later refer as \2
/separator to start the description of PATTERN
\2back reference to the second \( \) previously defined
:colon (taken litteraly)
\1back reference to the first \( \) previously defined
/separator to start the description of PATTERN
Last edited by ctsgnb; 07-06-2011 at 11:23 AM..
These 2 Users Gave Thanks to ctsgnb For This Post:
Neo sikku
# 30  
Old 07-06-2011
You might find this link useful, but I've not tried it yet:

Quote:
RegExr is an online tool for editing and testing Regular Expressions (RegExp / RegEx). It provides a simple interface to enter RegEx expressions, and visualize matches in real-time editable source text. It also provides ...
This User Gave Thanks to Neo For This Post:
sikku
# 31  
Old 07-06-2011
You are using this reg exp [^:]* only twice, which means only two tokens are considered while swapping?
Is this the reason the third token does not get affected?
# 32  
Old 07-06-2011
Quote:
Originally Posted by sikku
You are using this reg exp [^:]* only twice, which means only two tokens are considered while swapping?
Is this the reason the third token does not get affected?
Yes it is
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