April 2014
Beginner to intermediate
830 pages
15h 21m
Chinese
Content preview from Mathematica 錦囊妙計
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
5.2 字元刪除與取代
|
191
除去 XML 標籤
簡單的 XML 處理（如去除標籤）可使用
StringReplace[]
指令達成。
ch05.indd 191 2014/4/2 上午 06:13:06
192
|
第五章
對字串內的表示式求值與取代
[Page-192]
藉由對匹配子字串設定變數名稱，在進行取代時，可使用
ToExpression[]
指令對其求
值。
以下是日期字串處理的範例。
延伸資訊
StringPosition[]
的 使 用 請 見 訣 竅 5.5， 它 用 來 輸 出 子 字 串 位 置， 可 作 為
StringReplacePart[]
與
StringDrop[]
等指令的輸入。
XML 更複雜的處理請見訣竅 5.8 與 5.9。
5.3 擷取字元與子字串
問題點
你想擷取特定位置的字元或子字串。
ch05.indd 192 2014/4/2 上午 06:13:06
5.3 擷取字元與子字串
|
193
解決方案
使用字串模式
StringCases[]
指令以字串模式進行子字串擷取，其中有兩
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.