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<delect id="8anrc"><tfoot id="8anrc"></tfoot></delect>
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? Anchors
范例 ?
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PHP Manual
Pattern matching
Grouping
Grouping
Grouping
Sequence
Description
(...)
Group a regular expression to override default operator precedence.
(?r-s:pattern)
Apply option r and omit option s while interpreting pattern. Options may be zero or more of the characters i, s, or x.
Options
Option
Description
i
Case insensitive.
-i
Case sensitive.
s
Alters the meaning of '.' to match any character whatsoever.
-s
Alters the meaning of '.' to match any character except '\n'.
x
Ignores comments and whitespace in patterns. Whitespace is ignored unless it is backslash-escaped, contained within ""s, or appears inside a character range.
These options can be applied globally at the rules level by passing a combination of the bit flags to the lexer.
(?# comment )
Omit everything within (). The first ) character encountered ends the pattern. It is not possible for the comment to contain a ) character. The comment may span lines.