Java Regex Z Assertion - #1755
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lmasroca
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September 13, 2026 22:03
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Adds support for Java regex
\Zassertion and linebreak matcher\R:\Zis an end of input assertion that allows a final line terminator. This assertion matches at the end of the input or just before a line terminator with no characters following after it. This assertion's allowed terminators change depending on flagd,UNIX_LINES. For example^(?s)\Z.*matches with "",\n, etc. Unlike\zwhich just forces all following genes to zero-width,\Zmay also try to force a line terminator onto one of the following genes and the rest to zero-width.\Rmatches any Unicode linebreak sequence, is equivalent to\r\n|[\n-\r\u0085\u2028\u2029]. Unlike the previous mention, this is not an assertion, so it produces a sequence of characters (unlike assertions). This is represented by building aDisjunctionListRxGenethat can produce the same characters as its Java Pattern counterpart. This escape's characters are not modified by flags.Note: both of these recognize some single character line terminator sequences (like
\nor\u2029) and one two-character sequence\r\n(this sequence is a single line terminator,CRLF).