[Solved] What is wrong with this PowerShell regex pattern?$pattern = '[a-zA-Z0-9]++' — Ans: The ++ quantifier is invalid in PowerShell regex | PowerShell

PowerShell - Regular Expressions

What is wrong with this PowerShell regex pattern?

$pattern = '[a-zA-Z0-9]++'

AMissing escape characters

BCharacter class syntax is incorrect

CThe ++ quantifier is invalid in PowerShell regex

DNo error, pattern is valid

Step-by-Step Solution

Solution:

Step 1: Review the quantifier usage
++ is not a valid quantifier in PowerShell regex (uses .NET regex).
Step 2: Confirm character class syntax
[a-zA-Z0-9] is a valid character class; problem is with ++ quantifier.
Final Answer:
Invalid ++ quantifier causes error -> Option C
Quick Check:
Invalid quantifier ++ = Error [OK]

Quick Trick: Avoid ++ quantifier; use + or * instead [OK]

Common Mistakes:

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