Regular Expressions 101

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problem for homework

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Regular Expression
javascript

/
^(([^f]|f([^io]|o([^r]|r[a-z])|i([^ln]|l([^e]|e[a-z])|n([^d]|d[a-z]))))[a-z]*|(f(o|i|i(l|n))))?$
/

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Submitted by anonymous - 6 years ago