Regular Expressions 101

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/
offen kundig gut
/
i
offen kundig gut
matches the characters offen kundig gut literally (case insensitive)
Global pattern flags
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
i

Test String