How to assign value to variable with regex (bash)?

Question

I want to use regex in bash on variable assignment string

eg.

oldip="14\.130\.31\.172"
oldip_a="14.130.31.172" //How to use regex on this line.

How do I use regex for all '\' in $ oldip? Then set the new value to $ oldip_a.

Do you have any ideas?

+3

user1268200 14 Mar At 6:01 am

2 answers

Here's how you can do it:

oldip="14\.130\.31\.172"
oldip_a=`echo $oldip | sed 's/[\]//g'`
echo $oldip_a

OUTPUT

14.130.31.172

+2

torrential coding 14 Mar 12 at 6:10 am

jahroy · Accepted Answer · 2012-03-14T06:14:01+0000

I believe you want to use string replacement like this:

    oldip_a=${oldip//\\/}

Or something like that ... Of course, always the battle escapes the backslash!

A more obvious example:

    some_variable=${some_other_variable//replaceEachOfThese/withThis}

find "replace all matches" on this page:

http://tldp.org/LDP/abs/html/string-manipulation.html