Contract_Id包含
abc_rev4，abc_rev1，xxxxx_rev2，yyyyyyyy_rev4。
我只需要数据中的“rev”。
数据始终以单位数字结尾。
那么如何在substring或right
PS：“v”在rev中的位置始终是最后一个但第一个字符
答案 0 :(得分：-1)
这将从字符串中提取#include "ns3/core-module.h"
#include "ns3/mobility-module.h"
#include "ns3/applications-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/wifi-module.h"
#include "ns3/network-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
#include "ns3/bridge-helper.h"
#include "ns3/netanim-module.h"
#include <vector>
#include <stdint.h>
#include <sstream>
#include <fstream>
using namespace ns3;
int main (int argc, char *argv[])
{
uint32_t nWifis = 2;
uint32_t nStas = 2;
bool sendIp = true;
bool writeMobility = false;
CommandLine cmd;
cmd.AddValue ("nWifis", "Number of wifi networks", nWifis);
cmd.AddValue ("nStas", "Number of stations per wifi network", nStas);
cmd.AddValue ("SendIp", "Send Ipv4 or raw packets", sendIp);
cmd.AddValue ("writeMobility", "Write mobility trace", writeMobility);
cmd.Parse (argc, argv);
NodeContainer backboneNodes;
NetDeviceContainer backboneDevices;
Ipv4InterfaceContainer backboneInterfaces;
std::vector<NodeContainer> staNodes;
std::vector<NetDeviceContainer> staDevices;
std::vector<NetDeviceContainer> apDevices;
std::vector<Ipv4InterfaceContainer> staInterfaces;
std::vector<Ipv4InterfaceContainer> apInterfaces;
InternetStackHelper stack;
CsmaHelper csma;
Ipv4AddressHelper ip;
ip.SetBase ("192.168.0.0", "255.255.255.0");
backboneNodes.Create (nWifis);
stack.Install (backboneNodes);
backboneDevices = csma.Install (backboneNodes);
double wifiX = 0.0;
YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default ();
wifiPhy.SetPcapDataLinkType (YansWifiPhyHelper::DLT_IEEE802_11_RADIO);
for (uint32_t i = 0; i < nWifis; ++i)
{
// calculate ssid for wifi subnetwork
std::ostringstream oss;
oss << "wifi-default-" << i;
Ssid ssid = Ssid (oss.str ());
NodeContainer remoteHost;
remoteHost.Create(1);
Ptr<Node> remote=remoteHost.Get(0);
Ptr<Node> apnode=backboneNodes.Get(i);
PointToPointHelper p2p;
p2p.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
p2p.SetChannelAttribute ("Delay", StringValue ("2ms"));
NetDeviceContainer p2pDevices = p2p.Install(apnode,remote);
//setup remotenode
stack.Install (remoteHost);
// assign AP IP address to bridge, not wifi
//Ipv4InterfaceContainer
NodeContainer sta;
NetDeviceContainer staDev;
NetDeviceContainer apDev;
Ipv4InterfaceContainer staInterface;
Ipv4InterfaceContainer apInterface;
Ipv4InterfaceContainer remoteInterface;
MobilityHelper mobility;
BridgeHelper bridge;
WifiHelper wifi;
WifiMacHelper wifiMac;
YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default ();
wifiPhy.SetChannel (wifiChannel.Create ());
sta.Create (nStas);
mobility.SetPositionAllocator ("ns3::GridPositionAllocator",
"MinX", DoubleValue (wifiX),
"MinY", DoubleValue (0.0),
"DeltaX", DoubleValue (5.0),
"DeltaY", DoubleValue (5.0),
"GridWidth", UintegerValue (1),
"LayoutType", StringValue ("RowFirst"));
// setup the AP.
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobility.Install (remoteHost);
mobility.Install (backboneNodes.Get (i));
wifiMac.SetType ("ns3::ApWifiMac",
"Ssid", SsidValue (ssid));
apDev = wifi.Install (wifiPhy, wifiMac, backboneNodes.Get (i));
NetDeviceContainer bridgeDev;
bridgeDev = bridge.Install (backboneNodes.Get (i), NetDeviceContainer (apDev, backboneDevices.Get (i)));
// assign AP IP address to bridge, not wifi
apInterface = ip.Assign (bridgeDev);
remoteInterface = ip.Assign (p2pDevices);
// setup the STAs
stack.Install (sta);
mobility.SetMobilityModel ("ns3::ConstantPositionMobilityModel");
mobility.Install (sta);
wifiMac.SetType ("ns3::StaWifiMac",
"Ssid", SsidValue (ssid),
"ActiveProbing", BooleanValue (false));
staDev = wifi.Install (wifiPhy, wifiMac, sta);
staInterface = ip.Assign (staDev);
//creating udp applications
UdpEchoServerHelper echoServer (9);
ApplicationContainer serverApps = echoServer.Install(remoteHost.Get(0));
serverApps.Start (Seconds (1.0));
serverApps.Stop (Seconds (10.0));
UdpEchoClientHelper echoClient (remoteInterface.GetAddress(1), 9);
echoClient.SetAttribute ("MaxPackets", UintegerValue (1));
echoClient.SetAttribute ("Interval", TimeValue (Seconds (1.0)));
echoClient.SetAttribute ("PacketSize", UintegerValue (1024));
ApplicationContainer clientApps = echoClient.Install(sta.Get(0));
clientApps.Start (Seconds (2.0));
clientApps.Stop (Seconds (10.0));
// save everything in containers.
staNodes.push_back (sta);
apDevices.push_back (apDev);
apInterfaces.push_back (apInterface);
staDevices.push_back (staDev);
staInterfaces.push_back (staInterface);
wifiX += 20.0;
}
Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
/* Address dest;
std::string protocol;
if (sendIp)
{
dest = InetSocketAddress (staInterfaces[1].GetAddress (1), 1025);
protocol = "ns3::UdpSocketFactory";
}
else
{
PacketSocketAddress tmp;
tmp.SetSingleDevice (staDevices[0].Get (0)->GetIfIndex ());
tmp.SetPhysicalAddress (staDevices[1].Get (0)->GetAddress ());
tmp.SetProtocol (0x807);
dest = tmp;
protocol = "ns3::PacketSocketFactory";
}
OnOffHelper onoff = OnOffHelper (protocol, dest);
onoff.SetConstantRate (DataRate ("500kb/s"));
ApplicationContainer apps = onoff.Install (staNodes[0].Get (0));
apps.Start (Seconds (0.5));
apps.Stop (Seconds (3.0));
wifiPhy.EnablePcap ("wifi-wired-bridging", apDevices[0]);
wifiPhy.EnablePcap ("wifi-wired-bridging", apDevices[1]);*/
if (writeMobility)
{
AsciiTraceHelper ascii;
MobilityHelper::EnableAsciiAll (ascii.CreateFileStream ("wifi-wired-bridging.mob"));
}
AnimationInterface anim("edgecomp2.xml");
Simulator::Stop (Seconds (5.0));
Simulator::Run ();
Simulator::Destroy ();
}
的所有实例：
rev<强>输出：
SELECT REGEXP_REPLACE(
'abc_rev4,abc_rev1,xxxxx_rev2,yyyyyyyy_rev4',
'[^,]+(rev)\d(,|$)',
'\1\2'
) AS revs
FROM DUAL
如果您将每个列都放在一个单独的列中，那么：
REVS
---------------
rev,rev,rev,rev
<强>输出：
WITH table_name ( value ) AS (
SELECT 'abc_rev4' FROM DUAL UNION ALL
SELECT 'abc_rev1' FROM DUAL UNION ALL
SELECT 'xxxxx_rev2' FROM DUAL UNION ALL
SELECT 'yyyyyyyy_rev4' FROM DUAL
)
SELECT value,
SUBSTR( value, -4, 3 ) AS rev
FROM table_name;