xczxczxcz

$str='[00:31.71]风[00:32.51]停[00:32.90]了[00:33.26]云[00:33.56]知[00:33.90]道[00:35.01]'
$a=$str.Split('][') -notmatch '^$'
$ok="[$($a[0])]"+$($a -notmatch ':' -join '') +"`n[$($a[-1])]"
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xczxczxcz

纯去特殊符号：

$str= $str -replace '\[|\]|\d+:\d+\.\d+' -join ''
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