c# - Regular Expression for exact match of either 4 integers or 2 doubles in a line -


i trying identify lines in file have either 4 integer or 2 double values. regular expression below:

 var match = new regex(@"^(?<values>(((\d+\s*){4})|(\d+\.\d+\s*){2}))$");

sample of lines in file getting parsed:

element 1 2 8 24 2 1 1 0 1 129 2 2 0 0  30.200001 1000.0000 208 0 0 0 0 0 0 0  ..... .....

here, regular expression matches correctly above lines no 4 & 5. that's ok. but, it's matching line no 3 (0 1 129). that's problem me. kindly suggest:

  1. why regular expression matching line no 3.
  2. correct regular expression matches either 4 no. of integers or 2 no. of double values in line.

i think you're looking for:

^(((\d+\s+){3}\d+)|(\d+\.\d*\s+\d+\.\d*))\s*$

tested here.

explanations

^(   ((\d+\s+){3}\d+) # 4 numbers separated @ least 1 space   |   (\d+\.\d*\s+\d+\.\d*) # 2 floats separated @ least 1 space )\s*$ # optional spaces @ end of line (e.g., line 4)

the error in initial attempt lack of mandatory space between numbers.


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