Bash regular expressions in RHEL 6 - TAM tip
Quoted regular expressions no longer work in '[[ ]]' in Red hat Enterprise Linux 6. The way to do this now is to assign the regex pattern to a variable and then use the variable in a test.
Example
This will work in Bash 3 but not in Bash 4 because Bash 4 considers 'Link encap:Ethernet HWaddr (.*)' as a string instead of Regular expression:
if ![[ $info =~ 'Link encap:Ethernet HWaddr (.*)' ]]
To make the expression work in Bash 4 do the following:
info2='Link encap:Ethernet HWaddr (.*)' if ![[ $info =~ $info2 ]]
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