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used inside a character class (with PCRE1, they are treated as characters
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293 |
used inside a character class (with PCRE1, they are treated as characters
|
| 294 |
\samp{X}, \samp{R} and \samp{B}; with PCRE2 they cause an error).
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294 |
\samp{X}, \samp{R} and \samp{B}; with PCRE2 they cause an error).
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295 |
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| 296 |
A hyphen (minus) inside a character class is treated as a range, unless it
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A hyphen (minus) inside a character class is treated as a range, unless it
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| 297 |
is first or last character in the class definition. It can be quoted to
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is first or last character in the class definition. It can be quoted to
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| 298 |
represent the hypen literal (\samp{\\-}). PCRE1 allows an unquoted hyphen
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represent the hyphen literal (\samp{\\-}). PCRE1 allows an unquoted hyphen
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at some other locations inside a character class where it cannot represent
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at some other locations inside a character class where it cannot represent
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a valid range, but PCRE2 reports an error in such cases.
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a valid range, but PCRE2 reports an error in such cases.
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301 |
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| 302 |
In UTF-8 mode, some Unicode properties may be supported via
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302 |
In UTF-8 mode, some Unicode properties may be supported via
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| 303 |
\samp{\p{xx}} and \samp{\P{xx}} which match characters with and
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303 |
\samp{\p{xx}} and \samp{\P{xx}} which match characters with and
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properties see the PCRE documentation, but for example \samp{Lu} is
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305 |
properties see the PCRE documentation, but for example \samp{Lu} is
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| 306 |
\sQuote{upper case letter} and \samp{Sc} is \sQuote{currency symbol}.
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\sQuote{upper case letter} and \samp{Sc} is \sQuote{currency symbol}.
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(This support depends on the PCRE library being compiled with
|
307 |
(This support depends on the PCRE library being compiled with
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| 308 |
\sQuote{Unicode property support} which can be checked \emph{via}
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308 |
\sQuote{Unicode property support} which can be checked \emph{via}
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| 309 |
\code{\link{pcre_config}}. PCRE2 when compiled with Unicode support always
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309 |
\code{\link{pcre_config}}. PCRE2 when compiled with Unicode support always
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| 310 |
supports also Unicode properies.)
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supports also Unicode properties.)
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311 |
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| 312 |
The sequence \samp{(?#} marks the start of a comment which continues
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312 |
The sequence \samp{(?#} marks the start of a comment which continues
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| 313 |
up to the next closing parenthesis. Nested parentheses are not
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313 |
up to the next closing parenthesis. Nested parentheses are not
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| 314 |
permitted. The characters that make up a comment play no part at all in
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314 |
permitted. The characters that make up a comment play no part at all in
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| 315 |
the pattern matching.
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315 |
the pattern matching.
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