http://docwiki.embarcadero.com/Libraries/Tokyo/en/System.RegularExpressions.TRegExOption

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http://docwiki.embarcadero.com/Libraries/Tokyo/en/System.RegularExpressions.TRegExOption

Where is description of roNotEmpty option? What does this option do?
http://docwiki.embarcadero.com/Libraries/Tokyo/en/System.RegularExpressions.TRegExOption

Comments

  1. Primož GabrijelčičFebruary 5, 2018 at 5:41 AM

    roNotEmpty maps to System.RegularExpressionsCore.TPerlRegExState.preNotEmpty.

    TPerlRegExState = set of (
    preNotBOL, // Not Beginning Of Line: ^ does not match at the start of Subject
    preNotEOL, // Not End Of Line: $ does not match at the end of Subject
    preNotEmpty // Empty matches not allowed
    );

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  2. Christoph HillefeldFebruary 5, 2018 at 5:41 AM

    In TregEx.Create:
    if (roNotEmpty in Options) then
    FRegEx.State := [preNotEmpty];

    preNotEmpty is a TPerlRegExState which is defined as:
    TPerlRegExState = set of (
    preNotBOL, // Not Beginning Of Line: ^ does not match at the start of Subject
    preNotEOL, // Not End Of Line: $ does not match at the end of Subject
    preNotEmpty // Empty matches not allowed
    );

    So roNotEmpty seems to indicate that empty matches are not allowed.

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