Regular Expressions 101

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/
(uid.+[~])?~
/
1st Capturing Group
(uid.+[~])?
? Quantifier — Matches between zero and one times, as many times as possible, giving back as needed (greedy)
uid matches the characters uid literally (case sensitive)
.+
matches any character (except for line terminators)
+ Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
Match a single character present in the list below
[~]
~ matches the character ~ literally (case sensitive)
~ matches the character ~ literally (case sensitive)
Your regular expression does not match the subject string.

Regular Expression
No Match

/
/

Test String