Regular Expressions 101

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(?<prefix>(?:^|^[\s\n\t\r]+)\/(?:[\s\n\t\r]*)|(?<=[\s\n\t\r])\.:(?:[\s\n\t\r]*)|(?<=[\s\n\t\r])::(?:[\s\n\t\r]*))(?<command>[a-zA-Z0-9]+)(?:[\s\n\t\r]*)(?<arguments>[^]*?(?=(?<=[\s\n\t\r])\.:|(?<=[\s\n\t\r])::|$))
/
g
All the errors detected are listed below, from left to right, as they appear in the pattern.
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
? The preceding token is not quantifiable
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/
g

Test String