Pattern modifiers provide a way to apply flags to specific parts of a regular expression rather than the entire expression, enhancing flexibility and precision.
The syntax for pattern modifiers includes activating a flag with a question mark, deactivating with a hyphen, and creating non-capturing groups without flags.
Some flags, like 'v' and 'g', are unsupported in pattern modifiers because they complicate semantics or only apply to whole expressions.
Changing flags within a regular expression is beneficial for cases where partial matching conditions need to differ from the main pattern.
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