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Rory_Hewitt_139's avatar
Rory_Hewitt_139
Icon for Nimbostratus rankNimbostratus
Jun 04, 2014

Determining processing based on flags in a URL

I have a URL which will come in as   /features?features=10010001   where each '1' or '0' is a 'flag'. I need to check each flag in turn and depending on its value, XOR it with a matching flag s...
application delivery
devops
iRules
  • nitass_89166's avatar
    nitass_89166
    Jun 04, 2014

    that kinda works, except that the characters could potentially be 0, 1 or -

    may we remove - before scanning?

    % scan [string map {"-" ""} 10--01-00---01] %2d%2d%2d%2d a b c d
4

% put "$a $b $c $d"
10 1 0 1

    by the way, if flag is only one digit each, can we use split?

    % split [string map {"-" ""} 10--01-00---01] {}
1 0 0 1 0 0 0 1
nitass's avatar
nitass
Icon for Employee rankEmployee

what about scan or regexp?

 scan

% scan 10010001 %2d%2d%2d%2d a b c d
4

% put "$a $b $c $d"
10 1 0 1

% time "scan 10010001 %2d%2d%2d%2d a b c d" 1000
5.319 microseconds per iteration

 regexp

% regexp {(\d\d)(\d\d)(\d\d)(\d\d)} 10010001 m a b c d
1

% put "$a $b $c $d"
10 01 00 01

% time "regexp {(\d\d)(\d\d)(\d\d)(\d\d)} 10010001 m a b c d" 1000
3.077 microseconds per iteration
Rory_Hewitt_139's avatar
Rory_Hewitt_139
Icon for Nimbostratus rankNimbostratus
Jun 04, 2014
Hey @nitass, that kinda works, except that the characters could potentially be 0, 1 or -, so I can't use %d in scan or \d in regex. I can use %c in scan, but it converts them to a Unicode integer. So for instance, scan $flags %c%c%c%c%c%c%c%c flag1 flag2 flag3 flag4 flag5 flag6 flag7 flag8 gives me "49 45 48 45 45 45 45 49". Any way to simply chop them out as single characters?