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Ignore white spaces

alan6

Hello,

I have a scenario to read a file and ignore any lines which has only white spaces.

I am using perl with the following if condition. Can you let me know how to use similar if condition in SKILL?

if ($str =~ /^\s*$/) {

  print "String contains 0 or more white-space character and nothing else.";

}

Thank you in advance.

Parents

  • Either:

    if(pcreMatchp("^\\s*$" line) then
      ...
    else
      ...
    )

    or you could compile the pattern once at the beginning of the code:

    blankpat=pcreCompile("^\\s*$")
    ...
    when(pcreExecute(blankpat line)
       ...
    )

    Note that the backslash needs to be doubled, because backslash is a special character (escape) in strings, and so to get a \ in the pattern, you have to escape it, hence \\. The pcre functions provide "Perl Compatible Regular Expressions".

    There's also the blankstrp() function, although this would not see the line as blank if it ends with a carriage return (which it probably would do if it was read with gets()).

    Regards,

    Andrew.

Reply

  • Either:

    if(pcreMatchp("^\\s*$" line) then
      ...
    else
      ...
    )

    or you could compile the pattern once at the beginning of the code:

    blankpat=pcreCompile("^\\s*$")
    ...
    when(pcreExecute(blankpat line)
       ...
    )

    Note that the backslash needs to be doubled, because backslash is a special character (escape) in strings, and so to get a \ in the pattern, you have to escape it, hence \\. The pcre functions provide "Perl Compatible Regular Expressions".

    There's also the blankstrp() function, although this would not see the line as blank if it ends with a carriage return (which it probably would do if it was read with gets()).

    Regards,

    Andrew.

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