我有一个具有以下格式的统计文件。
---------- Begin Simulation Statistics ----------
simSeconds 0.000500 # Number of seconds simulated (Second)
simTicks 500000000 # Number of ticks simulated (Tick)
finalTick 500000000 # Number of ticks from beginning of simulation (restored from checkpoints and never reset) (Tick)
simFreq 1000000000000 # The number of ticks per simulated second ((Tick/Second))
hostSeconds 7.36 # Real time elapsed on the host (Second)
hostTickRate 67905191 # The number of ticks simulated per host second (ticks/s) ((Tick/Second))
hostMemory 658020 # Number of bytes of host memory used (Byte)
simInsts 956628 # Number of instructions simulated (Count)
simOps 1634485 # Number of ops (including micro ops) simulated (Count)
hostInstRate 129917 # Simulator instruction rate (inst/s) ((Count/Second))
hostOpRate 221975 # Simulator op (including micro ops) rate (op/s) ((Count/Second))
system.clk_domain.clock 1000 # Clock period in ticks (Tick)
system.cpu.numCycles 1000001 # Number of cpu cycles simulated (Cycle)
system.cpu.numWorkItemsStarted 0 # Number of work items this cpu started (Count)
system.cpu.numWorkItemsCompleted 0 # Number of work items this cpu completed (Count)
system.cpu.instsAdded 1824678 # Number of instructions added to the IQ (excludes non-spec) (Count)
system.cpu.nonSpecInstsAdded 85 # Number of non-speculative instructions added to the IQ (Count)
system.cpu.instsIssued 1774419 # Number of instructions issued (Count)
system.cpu.squashedInstsIssued 817 # Number of squashed instructions issued (Count)
system.cpu.squashedInstsExamined 190251 # Number of squashed instructions iterated over during squash; mainly for profiling (Count)
system.cpu.squashedOperandsExamined 226242 # Number of squashed operands that are examined and possibly removed from graph (Count)
system.cpu.squashedNonSpecRemoved 37 # Number of squashed non-spec instructions that were removed (Count)
system.cpu.numIssuedDist::samples 914073 # Number of insts issued each cycle
system.cpu.numIssuedDist::mean 1.941222 # Number of insts issued each cycle
system.cpu.numIssuedDist::stdev 2.095850 # Number of insts issued each cycle
system.cpu.numIssuedDist::underflows 0 0.00% 0.00% # Number of insts issued each cycle
system.cpu.numIssuedDist::0 403267 44.12% 44.12% # Number of insts issued each cycle
system.cpu.numIssuedDist::1 63660 6.96% 51.08% # Number of insts issued each cycle"
我把它一行一行地读了一遍。对于每一行，我想使用str_extract来获得每个stat的名称，然后是第一个值。
对于我使用的前者，str_extract(line, "(\S+)")。对于后者，我尝试了str_extract(line, "\s+(\S+)")，但得到了值之前的空白。我如何才能将其更改为不包括该部分？
此外，是否存在更多的"；优雅的"；实现相同目标的方式？
使用
str_extract(test3, "(?<!\S|^)\S+")
请参阅正则表达式证明。
解释
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(?<! look behind to see if there is not:
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S non-whitespace (all but n, r, t, f,
and " ")
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| OR
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^ the beginning of the string
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) end of look-behind
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S+ non-whitespace (all but n, r, t, f,
and " ") (1 or more times (matching the
most amount possible))