PowerShell:
Using regular expressions

How to:

In PowerShell, you can use the -match, -replace, and -split operators, among others, to perform actions with regular expressions. Let’s explore a few examples:

Using -match to check if a string matches a pattern

This operator returns $true if the pattern is found within the string, and $false otherwise.

"hello world" -match "\w+orld"
# Output: True

Extracting matches

You can extract the matched value by accessing the automatic variable $matches.

if ("I have 100 apples" -match "\d+") {
    "Number found: " + $matches[0]
}
# Output: Number found: 100

Using -replace for substitutions

The -replace operator replaces all occurrences of a pattern with a specified replacement string.

"foo bar baz" -replace "ba[rz]", "qux"
# Output: foo qux qux

Splitting strings with -split

Split a string into an array of substrings based on a regex pattern.

"The quick-brown_fox jumps" -split "[-_ ]"
# Output: The quick brown fox jumps

Advanced Pattern Matching

PowerShell also supports more complex regex operations via the [regex] class, giving you access to methods like Matches(), Replace(), and Split().

[regex]::Matches("June 24, August 9, Dec 12", "\b[A-Za-z]+\b").Value
# Output: June August Dec

[regex]::Replace("100,000", "\B(?=(?:\d{3})+(?!\d))", ",")
# Output: 100,000

[regex]::Split("one,two;three four", ",|;| ")
# Output: one two three four

These examples show the power and versatility of regular expressions in PowerShell for data manipulation and pattern matching. By harnessing regex, programmers can perform complex text processing efficiently.