正则表达式_matches（Regex）

[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 '\b\d\d\d\b'

-cmatch 匹配大小写

#通过 $matches 取返回值

'\b\d\d\d\b' = '\b[0-9][0-9][0-9]\b' = '\b\d\d\d\b'

$p = "111,222,333"
$p -match '\b\d\d\d\b'  #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,"\b\d\d\d\b")

[Regex]写法二：

$p = "111,222,333"
$regex = [regex]"\b\d\d\d\b"
$regex.Matches($p)

返回结果如下图：

$pattern = "a*"

$pattern=[regex]'\b\d\b'

$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