Perl i Modifier [ignore case]

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Perl i Modifier

The ignore-case (or case-insensitive) modifier (i) is used to match patterns without regard to case.
Thus:

/pattern/i

will match any of these successfully:

Pattern 
PATTERN 
PaTtErN

modifier: A character placed after a match or substitution pattern that modifies the matching process.
For example, the i modifier makes the match case-insensitive. Also called a flag.