Question

E.g。我有一个这样的文本文件：

abc,#32432,he#llo
xyz,#989,wor#ld

我希望将其改为：

abc,32432,he#llo
xyz,989,wor#ld

从每行中删除第一个“＃”。怎么做？感谢。

Answer 1

要仅更改字符串中的第一个#，您可以使用像这样的正则表达式

"abc,#32432,he#llo" -replace '(.*?)#(.*$)', '${1}${2}'

Regexbuddy的解释

# (.*?)#(.*$)
# 
# Options: Case insensitive; Exact spacing; Dot doesn't match line breaks; ^$ match at line breaks; Parentheses capture
# 
# Match the regex below and capture its match into backreference number 1 «(.*?)»
#    Match any single character that is NOT a line break character (line feed) «.*?»
#       Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
# Match the character “#” literally «#»
# Match the regex below and capture its match into backreference number 2 «(.*$)»
#    Match any single character that is NOT a line break character (line feed) «.*»
#       Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
#    Assert position at the end of a line (at the end of the string or before a line break character) (line feed) «$»

Answer 2

您可以使用简单的正则表达式替换非哈希值的哈希值，如下所示：

Get-Content input_file.txt | % {$_ -replace '(?<=^[^#]+)#'} | Set-Content output_file.txt

powershell：如何删除每行文本中的第一个＃？

2 个答案: