How to get this regex working?

i have a small problem, i want to find in

<tr><td>3</td><td>foo</td><td>2</td>开发者_Python百科

the foo, i use:

$<tr><td>\d</td><td>(.*)</td>$

to find the foo, but it dont work because it dont match with the </td> at the end of foo but with the </td> at the end of the string

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You have to make the .* lazy instead of greedy. Read more about lazy vs greedy here.
Your end of string anchors ($) also don't make sense. Try:

<tr><td>\d<\/td><td>(.*?)<\/td>

(As seen on rubular.)

NOTE: I don't advocate using regex to parse HTML. But some times the task at hand is simple enough to be handled by regex, for which a full-blown XML parser is overkill (for example: this question). Knowing to pick the "right tool for the job" is an important skill in programming.

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Your leading $ should be a ^.

If you don't want to match all of the way to the end of the string, don't use a $ at the end. However, since * is greedy, it'll grab as much as it can. Some regex implementations have a non-greedy version which would work, but you probably just want to change (.*) to ([^<]*).

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Use:

^<tr><td>\d</td><td>(.*?)</td>

(insert obligatory comment about not using regex to parse xml)