一个简单的正则表达式匹配

Question

I have (from long ago) problems with regex matching... (I simply can't understand and remeber this damn thing...)

However, i'd like to find a string that is the end or a table row and the beginning of another row:

<tr>(-line-break or spaces or both...)</tr> 

I am trying with

Regex.Match(_mainTable, @"</tr>*<tr>")

but it returns Empty

Answer 1

the * is a quantifier. That means zero or more of the previous match, which in your expression is the > that appears before the * .. what you what is to match "any spaces" the is indicated by the abreviation \\s which is a shortcut for: any character in the set [ \\t\\r\\n]

so your code should be

Regex.Match(_mainTable, @"</tr>\s*<tr>")

Answer 2

只需添加\\s*即可在换行符之间进行匹配。

Regex.Match(_mainTable, @"</tr>\s*<tr>")