How can I grep for empty functions?












1














I'm recursively looking in a directory for all functions containing only a blank one-line comment, such as the following:



public function index()
{
//
}


I tried grep -PR "//$" * with no luck. Any help would be much appreciated, and thanks in advance.










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  • 1




    Doesn't grep -PR "^s*//s*$" * work?
    – terdon
    16 mins ago










  • It does. Thanks!
    – Brandon M.
    7 mins ago
















1














I'm recursively looking in a directory for all functions containing only a blank one-line comment, such as the following:



public function index()
{
//
}


I tried grep -PR "//$" * with no luck. Any help would be much appreciated, and thanks in advance.










share|improve this question







New contributor




Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 1




    Doesn't grep -PR "^s*//s*$" * work?
    – terdon
    16 mins ago










  • It does. Thanks!
    – Brandon M.
    7 mins ago














1












1








1







I'm recursively looking in a directory for all functions containing only a blank one-line comment, such as the following:



public function index()
{
//
}


I tried grep -PR "//$" * with no luck. Any help would be much appreciated, and thanks in advance.










share|improve this question







New contributor




Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I'm recursively looking in a directory for all functions containing only a blank one-line comment, such as the following:



public function index()
{
//
}


I tried grep -PR "//$" * with no luck. Any help would be much appreciated, and thanks in advance.







shell grep regular-expression






share|improve this question







New contributor




Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question






New contributor




Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 19 mins ago









Brandon M.Brandon M.

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New contributor




Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor





Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Brandon M. is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 1




    Doesn't grep -PR "^s*//s*$" * work?
    – terdon
    16 mins ago










  • It does. Thanks!
    – Brandon M.
    7 mins ago














  • 1




    Doesn't grep -PR "^s*//s*$" * work?
    – terdon
    16 mins ago










  • It does. Thanks!
    – Brandon M.
    7 mins ago








1




1




Doesn't grep -PR "^s*//s*$" * work?
– terdon
16 mins ago




Doesn't grep -PR "^s*//s*$" * work?
– terdon
16 mins ago












It does. Thanks!
– Brandon M.
7 mins ago




It does. Thanks!
– Brandon M.
7 mins ago










1 Answer
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Your grep is only matching // that are at the very end of the line. Your functions probably have whitespace characters after that. You might also want to allow whitespace before the //. so search for lines that consist entirely of 0 or more whitespace characters, then the // and then 0 or more whitespace characters:



grep -PR '^s*//s*$'




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    Your grep is only matching // that are at the very end of the line. Your functions probably have whitespace characters after that. You might also want to allow whitespace before the //. so search for lines that consist entirely of 0 or more whitespace characters, then the // and then 0 or more whitespace characters:



    grep -PR '^s*//s*$'




    share


























      0














      Your grep is only matching // that are at the very end of the line. Your functions probably have whitespace characters after that. You might also want to allow whitespace before the //. so search for lines that consist entirely of 0 or more whitespace characters, then the // and then 0 or more whitespace characters:



      grep -PR '^s*//s*$'




      share
























        0












        0








        0






        Your grep is only matching // that are at the very end of the line. Your functions probably have whitespace characters after that. You might also want to allow whitespace before the //. so search for lines that consist entirely of 0 or more whitespace characters, then the // and then 0 or more whitespace characters:



        grep -PR '^s*//s*$'




        share












        Your grep is only matching // that are at the very end of the line. Your functions probably have whitespace characters after that. You might also want to allow whitespace before the //. so search for lines that consist entirely of 0 or more whitespace characters, then the // and then 0 or more whitespace characters:



        grep -PR '^s*//s*$'





        share











        share


        share










        answered 4 mins ago









        terdonterdon

        129k31252427




        129k31252427






















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