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

Question

I want to use regex in bash at line of variable assignment

e.g.

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

How to use regex to del all '\' in $oldip? Then assign to new value to $oldip_a.

Do you have any idea?

jahroy · Accepted Answer · 2012-03-14 06:37:20Z

4

I believe you want to use string replacement like this:

    oldip_a=${oldip//\\/}

Or something like that... Of course there's always some battle escaping backslashes!

A more obvious example:

    some_variable=${some_other_variable//replaceEachOfThese/withThis}

search for "replace all matches" on this page:

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

answered Mar 14, 2012 at 6:14

jahroy

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3 Comments

I think you have a typo (extra / at the end) - should be oldip_a=${oldip//\\/}

That's why I threw in the something like that... Thanks!

No problem. I would have voted up your answer but i ran out of daily votes!

torrential coding · Accepted Answer · 2012-03-14 06:10:32Z

3

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

answered Mar 14, 2012 at 6:10

torrential coding

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