Regular Expressions 101

Group 1(Get-Content\s+(['"]?)C:\\bulk\\)

Get-Contentthe literal text Get-Content (case sensitive)

\s+any whitespace character, repeated at least once

Group 2(['"]?)

Character Class['"]?

?matches at most one character from the set below:

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

C:the literal text C: (case sensitive)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

bulkthe literal text bulk (case sensitive)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

.*?any character (except for line terminators), repeated any number of times

Group 3(\.txt\2)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

txtthe literal text txt (case sensitive)

\2the text saved by group 2

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(Get-Content\s+(['"]?)C:\\bulk\\).*?(\.txt\2)

$line = ''
Get-Content C:\bulk\XXX.txt | 
    Select-String -Pattern 'TEMP' |
        ForEach-Object {
        #blah blah
        }

${1}BBB$3