https://bugs.llvm.org/show_bug.cgi?id=36492

            Bug ID: 36492
           Summary: FileCheck cannot match a particular regex combination
           Product: Test Suite
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: lit
          Assignee: unassignedb...@nondot.org
          Reporter: rafael.espind...@gmail.com
                CC: dan...@zuster.org, llvm-bugs@lists.llvm.org

Given

$ cat foo                                                                      
                                                                               
                                                                               
                      foo foo foo                                              
                                                                               
                                                                               
                                                                            foo
foo foo
foo foo foo                                                                    
                                                                               
                                                                               
                                                      foo foo foo
foo foo foo
foo foo foo
$ cat check                                                                     
CHECK: foo foo foo                                                              
CHECK: foo [[ABC:foo]] foo                                                      
CHECK: foo [[ABC:foo]] [[ABC]]                                                  
CHECK: {{.*}} [[ABC:foo]] [[ABC]]                                               
CHECK: {{(foo)}} [[ABC:foo]] [[ABC]]                                            
CHECK: {{(foo)?}} [[ABC:foo]] [[ABC]]

Only the last line fails to match:

$ FileCheck check  < foo
check:6:8: error: expected string not found in input
CHECK: {{(foo)?}} [[ABC:foo]] [[ABC]]

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