Re: regex confusion -- not matching; think it should?

[Linda Walsh]

DJ Mills wrote:
> On Wed, Jun 12, 2013 at 6:53 PM, Linda Walsh <bash@tlinx.org 
> <mailto:bash@tlinx.org>> wrote:
>
>     The trace looks aprolike this:
>
>             ./ifc#137(handle_bonding_ops)> (( 18>3 ))
>             ./ifc#138(handle_bonding_ops)> [[  mode=balance-rr 0 =~
>
>        
>     ^([a-zA-Z][-a-zA-Z0-9_]+)=(.+)__[[:space:]]+[a-zA-Z][-a-zA-Z0-__9_]+=.+.*$
>     ]]
>
>             ./ifc#142(handle_bonding_ops)> [[  mode=balance-rr 0 =~
>             ^([a-zA-Z][-a-zA-Z0-9_]+)=(.+)__$ ]]
>             ./ifc#145(handle_bonding_ops)> break
>
>
>     (#138 is all 1 line)
>     ---- the source code looks like this:
>
>       my id='[a-zA-Z][-a-zA-Z0-9_]+'
>       while ((${#bond_ops}>3)); do
>         if [[ $bond_ops =~ ^($id)=(.+)[[:space:]]+$id=.+.__*$ ]]; then
>           ...
>         elif [[ "$bond_ops" =~ ^($id)=(.+)$ ]]; then
>          ...
>         else break; fi
>
>     ---
>     I would think the 2nd match would match it, but no luck...
>     Note the 2nd source line has double quotes due to testing...
>     Originally it had no quotes, as I don't believe they are
>     necessary in this case.  Regardless, neither way matches.
>
>     So if not obvious, bond_ops has "mode=balance-rr 0" in it.
>
>     Thanks...
>
>
>
> Just FYI, you should be using [[:alpha:]] and [[:alnum:]], as they're 
> safe for all locales.
----
        Since this is for the linux kernel, I'd be better off
just using locale=C;  As for the quotes .. see the 2nd and 3rd lines
of the bottom paragraph...;-)


 You can't count on a-z or A-Z unless the locale is
> C or POSIX. And no, quotes on the LHS of [[ are not needed, as 
> wordsplitting and pathname expansion do not occur within the [[ keyword.