Regular Expressions 101

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/
^.{3,50}$
/
^ asserts position at start of the string
.
matches any character (except for line terminators)
{3,50} matches the previous token between 3 and 50 times, as many times as possible, giving back as needed (greedy)
$ asserts position at the end of the string
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/

Test String