Replace string with line break with another string in Powershell-CodePudding

I want to replace

$fieldTool.GetFieldValue($i
    tem,"Title")

with

{{(sc_get_field_value i_item 'Title')}}

The original string has a line break and I am using 'n like this $fieldTool.GetFieldValue($i'ntem,"Title")

This is the code

  $template = '<div >$fieldTool.GetFieldValue($i
  tem,"Title")</div>'
  $matchString = '$fieldTool.GetFieldValue($i'ntem,"Title")'
  $pattern = $([regex]::escape($matchString))
  $replaceString = "{{(sc_get_field_value i_item 'Title')}}"
  $newtemplate = $template -replace $pattern, $replaceString
  Write-Host $newtemplate

The above code is not working. How can I replace the string with line break with another string.

Any suggestion would be appreciated.

Thanks in advance

CodePudding user response：

To replace newlines, you should use regex pattern \r?\n. This will match both *nix as well as Windows newlines.

In your template string however, there are multiple characters that have special meaning in regex, therefore you need to do [regex]::Escape(), but that also would wrongfully escape the characters \r?\n, rendering it as \\r\?\\n, so adding that in the $matchString before escaping it, would be of no use.

You can manually first replace the newline with a character that otherwise is not present in the $matchString and has no special meaning in regex.

$template = '<div >$fieldTool.GetFieldValue($i
tem,"Title")</div>'
# for demo, I chose to replace the newline with an underscore
$matchString = '$fieldTool.GetFieldValue($i_tem,"Title")'
# now, escape the string and after that replace the underscore by the wanted \r?\n pattern
$pattern = [regex]::escape($matchString) -replace '_', '\r?\n'
# $pattern is now: \$fieldTool\.GetFieldValue\(\$i\r?\ntem,"Title"\)
$replaceString = "{{(sc_get_field_value i_item 'Title')}}"

# this time, the replacement should work
$newtemplate = $template -replace $pattern, $replaceString
Write-Host $newtemplate  # --> <div >{{(sc_get_field_value i_item 'Title')}}</div>