如何写正则表达式以特定的字符串开始和结束？

Question

How to write regex for this paricular situation. Here letters in [] is not fixed but letters without [] is fixed.

http://www.abc.com/fixed/[any small letters]/[anyletters]/fixed.html

Answer 1

http://www.abc.com/fixed/[a-z]+/[a-zA-Z]+/fixed.html

可能更改为更宽容：

http://www.abc.com/fixed/[a-z]+/[^/]+/fixed.html

Answer 2

You can use lookarounds for that. One problem may be that they are not available in every language. For instance Javascript has only positive lookahead.

Oh, you mean something different... try this:

http://www.abc.com/fixed/[a-z]+/[\w\D^_]+/fixed.html