Replace regex_split with MDAL::split in mdal_mike21.cpp #496
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…sisting of a mix of tab characters and spaces, so we need to replace the tab characters with spaces before using the MDAL::split function to process the data.
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mike21 dirver uses regular expressions to analyze text data, it is very slow.
regex_split test
$ time ./tools/mdalinfo ./tlgs.mesh
mdalinfo 1.3.0
Mesh File: ./tlgs.mesh
Mesh loaded: OK
Driver: Mike21
Vertex count: 146054
Edge count: 0
Face count: 279552
Edge count: 0
Projection: PROJCS["CGCS2000_3_Degree_GK_CM_117E"]
Datasets loaded: OK
Groups count: 2
VertexType
Bed Elevation
real 0m40.182s
user 0m38.331s
sys 0m0.030s
MDAL::split test
$ time ./tools/mdalinfo ./tlgs.mesh
mdalinfo 1.3.0
Mesh File: ./tlgs.mesh
Mesh loaded: OK
Driver: Mike21
Vertex count: 146054
Edge count: 0
Face count: 279552
Edge count: 0
Projection: PROJCS["CGCS2000_3_Degree_GK_CM_117E"]
Datasets loaded: OK
Groups count: 2
VertexType
Bed Elevation
real 0m2.458s
user 0m0.800s
sys 0m0.042s