no lookbehind

Author: scivision

+stdlib/h5get_version.m

@@ -2,8 +2,11 @@
 
 function v = h5get_version()
 
-[major, minor, rel] = H5.get_libversion();
-
-v = sprintf('%d.%d.%d', major, minor, rel);
+try
+  [major, minor, rel] = H5.get_libversion();
+  v = sprintf('%d.%d.%d', major, minor, rel);
+catch
+  v = '';
+end
 
 end

+stdlib/nc_get_version.m

@@ -2,6 +2,10 @@
 
 function v = nc_get_version()
 
-v = netcdf.inqLibVers;
+try
+  v = netcdf.inqLibVers;
+catch
+  v = '';
+end
 
 end

+stdlib/perl_exe.m

@@ -12,7 +12,7 @@
 
 ps = [fileparts(mfilename("fullpath")), '/private/executable.pl'];
 
-exe = string.empty;
+exe = '';
 
 try
   [r, s] = perl(ps);

+stdlib/platform_tell.m

@@ -44,6 +44,8 @@
   raw.xcode_version = stdlib.xcode_version();
 end
 
+if ~stdlib.isoctave()
+
 langs = {'C', 'Cpp', 'Fortran'};
 for i = 1:length(langs)
   lang = langs{i};
@@ -59,6 +61,8 @@
   end
 end
 
+end
+
 try
   json = jsonencode(raw, 'PrettyPrint', true);
 catch e

+stdlib/root_dir.m

@@ -13,9 +13,11 @@
 if startsWith(p, ["/", filesep])
   r = extractBefore(p, 2);
 elseif ispc()
-  r = regexp(p, '(?<=^[A-Za-z]:)([\\/])', 'match', 'once');
-  if ismissing(r)
-    r = "";
+  m = regexp(p, '^[A-Za-z]:([\\/])', 'tokens', 'once');
+  if isempty(m)
+    r = extractBefore(p, 1);
+  else
+    r = m{1};
   end
 else
   r = extractBefore(p, 1);

+stdlib/xcode_version.m

@@ -7,7 +7,10 @@
 if ismac()
   [s, m] = system('pkgutil --pkg-info com.apple.pkg.CLTools_Executables');
   if s == 0
-    v = regexp(m, '(?<=version:\s*)(\d+\.\d+(\.\d+)+)', 'match', 'once');
+    t = regexp(m, 'version:\s*(\d+\.\d+(\.\d+)+)', 'tokens', 'once');
+    if ~isempty(t)
+      v = t{1};
+    end
   else
     warning("stdlib:xcode_version:runtimeError", "%d failed to get Command Line Tools Xcode version", s)
   end