A tentative study of the regular expression must be known

When I went to school, I always felt that this technique was broken, and that technology was exploding, and how was the new technology. Unfortunately, not how to contact, put into the enterprise, know that something even do a sales of knowledge points qualification may not be. Wood approach, look slowly.

Regular expressions belong to one of the techniques mentioned above. Now only remember learning to compile the principle of the time there have been contact, at present, early forget clean, that also know how to use AH. Not commonly used things will slowly forget, even if before how familiar, now do not check the information can not get out.

I do not know where to look, only remember that a word, a book, even if you learn a little bit of knowledge in the book, this book is not white buy. Now reading to accept other people's views affect very deep, this said reading a few days to read better, that said reading because how fast. Feel completely fooled, because they are not suitable for this way of reading. Note habit slow, because slow down I can know what the author wants to say, what the words mean. Even when I look back at the books I read before, I always feel that there is a lot of things that have never been remembered.

Regular, in short, his purpose is to find and replace. The specific implementation of language-related, different language implementation, different functions, grammar is also large and small have such or so different. Learn a kind, learning other to get started also will quickly.

The plain text itself is also a regular expression. e.g matches "Hello World" with Hello as regular expression. The generic regular language matches only the first matched word, but provides parameters that match multiple words. The majority of regular expressions support a case-insensitive match, and some regular expressions can be used to set whether the letter is case-sensitive.

I remember writing as a draft or something, but now lazy.

　　

A tentative study of the regular expression must be known