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\D: Matches anything \d doesn t match (nondigits). \s: Matches whitespace characters (spaces, tabs, newlines, form feeds). \S: Matches anything \S doesn t match (non-whitespace). \A: Matches the beginning of a string. \Z: Matches the end of a string. ^: Matches the beginning of a line (or string). $: Matches the end of a line (or string).

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You ve encountered several methods already that modify the list without returning anything, and in most cases that behavior is quite natural (as with append, for example). But I want to emphasize this behavior in the case of sort because so many people seem to be confused by it. The confusion usually occurs when users want a sorted copy of a list while leaving the original alone. An intuitive (but wrong) way of doing this is as follows: >>> x = [4, 6, 2, 1, 7, 9] >>> y = x.sort() # Don't do this! >>> print y None Because sort modifies x but returns nothing, you end up with a sorted x and a y containing None. One correct way of doing this would be to first bind y to a copy of x, and then sort y, as follows: >>> >>> >>> >>> [4, >>> [1, x = [4, 6, 2, 1, 7, 9] y = x[:] y.sort() x 6, 2, 1, 7, 9] y 2, 4, 6, 7, 9]

You can use the following characters after a character, character range, or a sub-expression (as provided within parentheses) to modify how that element is matched by the regular expression: +: Matches one or more of the previous. + : Matches one or more, but as few as possible, of the previous. : Matches zero or one of the previous. *: Matches zero or more of the previous. * : Matches zero or more, but as few as possible, of the previous.

When you use the Hide Slide feature, a hidden slide icon containing the slide number is displayed in the lower-right corner of each slide in Slide Sorter view To reset the hidden slides to make them viewable again during a presentation, select the hidden slides, rightclick any slide, and click Hide Slide again the hidden slide icon will disappear Keep in mind that hidden slides don t appear on screen when you run a presentation, but they will be printed unless you clear the Print Hidden Slides check box in the Print dialog box When you hide the slides as you scale to time, you maintain a single presentation le that has the exibility to accommodate different-length presentations.

Exceptions are covered in 8, but this section gives a hierarchical list of all standard exception classes within Ruby. You can raise these for your own purposes using raise. This list might also be useful if you want to catch certain exceptions. For example, IOError is useful to rescue in many situations.

To get more information about certain exceptions, you can raise them from irb to get a more complete error message. For example:

Because of the hierarchy of ideas you wrote into Act II, you can scale your presentation up or down to time without losing the core integrity of the story with only a few clicks of your mouse..

Errno::EAGAIN: Resource temporarily unavailable from (irb):1 from :0

Recall that x[:] is a slice containing all the elements of x, effectively a copy of the entire list. Simply assigning x to y wouldn t work because both x and y would refer to the same list:

Here s the exception class list:

6

Exception fatal NoMemoryError ScriptError LoadError NotImplementedError SyntaxError Interrupt SignalException StandardError ArgumentError IndexError EOFError IOError LocalJumpError NameError NoMethodError FloatDomainError RangeError RegexpError RuntimeError SecurityError Errno::E2BIG Errno::EACCES Errno::EADDRINUSE Errno::EADDRNOTAVAIL Errno::EAFNOSUPPORT Errno::EAGAIN Errno::EALREADY Errno::EBADF

Errno::EBADMSG Errno::EBUSY Errno::ECHILD Errno::ECONNABORTED Errno::ECONNREFUSED Errno::ECONNRESET Errno::EDEADLK Errno::EDESTADDRREQ Errno::EDOM Errno::EDQUOT Errno::EEXIST Errno::EFAULT Errno::EFBIG Errno::EHOSTDOWN Errno::EHOSTUNREACH Errno::EIDRM Errno::EILSEQ Errno::EINPROGRESS Errno::EINTR Errno::EINVAL Errno::EIO Errno::EISCONN Errno::EISDIR Errno::ELOOP Errno::EMFILE Errno::EMLINK Errno::EMSGSIZE Errno::EMULTIHOP Errno::ENAMETOOLONG Errno::ENETDOWN Errno::ENETRESET Errno::ENETUNREACH Errno::ENFILE Errno::ENOBUFS Errno::ENODATA Errno::ENODEV Errno::ENOENT Errno::ENOEXEC Errno::ENOLCK Errno::ENOLINK Errno::ENOMEM Errno::ENOMSG

>>> >>> >>> [1, >>> [1,