[0-9a-zA-Z.%+-] 匹配中括号中的 0-9 或者 a-z 或者 A-Z 或者 . 或者 % 或者 + 或者 -
$p = "111,222,333"
$p -match 'ddd'
-cmatch 匹配大小写
#通过 $matches 取返回值
'ddd' = '[0-9][0-9][0-9]' = 'ddd'
$p = "111,222,333"
$p -match 'ddd' #只会返回一个匹配项
使用 [Regex]:Matches，会将对该字符串中所有的匹配部分都返回，所以要尽量写全regex
[Regex]写法一：
$p = "111,222,333"
[regex]:Matches($p,"ddd")
[Regex]写法二：
$p = "111,222,333"
$regex = [regex]"ddd"
$regex.Matches($p)
返回结果如下图：
$pattern = "a*"
$pattern=[regex]'d'
$input = "abaabb"
[regex]::matches($input,$pattern) #返回所有匹配结果
[regex]::ismatch($input,$pattern) #返回 true or false
=========================================================
$name = "abc_2014-06-19.txt"
$name -cmatch '^abc_(?<year>d{4})-(?<month>d{2})-(?<day>d{2}).txt'
$matches
$matches.year
$matches.day
$id="/cs/blogs/tips/archive/2014/06/12/be-aware-of-side-effects.aspx"
if ($id -cmatch '^/cs/blogs/tips/archive/(?<year>d{4})/(?<month>d{2})/(?<day>d{2})/(?<name>.+).aspx$') {
$year = $matches['year']
$month = $matches['month']
$day = $matches['day']
$name = $matches['name']
}
$matches
参考：http://www.pstips.net/regex-describing-patterns.html