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metacharacters
元字符
常用释义
词性释义
n.
[计]元字符（metacharacter 的复数）
例句
全部
元字符
A number
of
metacharacters
require
special
treatment
when
trying
to
match
them
.
许多元字符要求在试图匹配它们时特别对待。
The
metacharacters
described
in
the
following
table
do
not
cause
the
engine
to
advance
through the
string
or
consume
characters
.
下表中描述的元字符不会使引擎在字符串中前进或使用字符。
The
word
boundary
metacharacters
ensure
that
only
whole
words
are
detected
.
字边界元字符确保只检测整个单词。
A few
characters
are
used
in
patterns
as
metacharacters
to
indicate
repetition
,
grouping
,
or
positioning
.
几个字符模式中使用的元字符显示重复，分组，或定位。
Here
's
a
complete
list of the
metacharacters
;
their
meanings
will
be
discussed
in
the
rest
of
this
HOWTO
.
这里有一个元字符的完整列表；其含义会在本指南余下部分进行讨论。
Explains
the
concept
of
escaping
characters
and
how
to
create
a
regular
expression
that
matches
metacharacters
.
说明转义符的概念以及如何创建与元字符匹配的正则表达式。
The set
of
metacharacters
gives
regular
expressions
their
processing
power
.
元字符使正则表达式具有处理能力。
Explains
the
characters
that
comprise
a
regular
expression
, the
characters
that
comprise
metacharacters
,
and
the
behavior
of
metacharacters
.
说明构成正则表达式的字符、构成元字符的字符以及元字符的行为。
Ordinary
characters
consist
of
all
printable
and
non-printable
characters
that are
not
explicitly
designated
as
metacharacters
.
普通字符包括没有显式指定为元字符的所有可打印和不可打印字符。
Regular
expressions
are
built
from
characters
and
operators
,
augmented
by
metacharacters
.
正则表达式通过元字符加强的字符和操作符构建。
Small
expressions are
combined
by
using
a
variety
of
metacharacters
and
operators
to
create
larger
expressions
.
也就是，使用各种中继字元及运算子结合小型运算式来建立较大的运算式。
There are
two
types
of
characters
that are
used
in
regular
expressions
:
metacharacters
and
normal
characters
.
正则表达式中使用以下两种类型的字符：元字符和常规字符。
Setting
up
crontab
entries
requires
a
string
with
escaped
shell
metacharacters
,
so
it is
best
done with
simple
commands
and
parameters
.
设置crontab条目需要一个包含转义的shell元字符的字符串，所以适合于简单的命令和参数。
The
following
table
describes
the
metacharacters
that
affect
matching
.
下表描述了影响匹配的元字符。
Metacharacters
are
not
active
inside
classes
.
元字符在类别里并不起作用。
A
string
of characters with
any
metacharacters
converted
to
their
escaped
form
.
包含任何已转换为转义形式的元字符的字符串。
There are
some
metacharacters
that
we
haven't
covered
yet
.
Most
of them
will
be covered
in
this
section
.
还有一些我们还没展示的元字符，其中的大部分将在本节展示。
It
's
also
used
to escape
all
the
metacharacters
so
you
can
still
match
them
in
patterns
;
它也可以用于取消所有的元字符，这样你就可以在模式中匹配它们了。
The
following
table
contains
the
complete
list
of
metacharacters
and
their
behavior
in
the
context
of
regular
expressions
下表包含了元字符的完整列表以及它们在正则表达式上下文中的行为
You
can
override the
capture
by
using
the non-capturing
metacharacters
?
:
,
可以通过使用非捕获元字符？：、？
1·Another useful txt2regex option is — showmeta, which outputs a table consisting of all the metacharacters used in building regexps for the supported applications.
另一个有用的txt2regex选项是——showmeta，此选项可输出包含为所支持的应用程序构建regexp时使用的所有元字符的表。