CODEWITHSUNDEEP
regex
DjEasyDick
DjEasyDick

Reputation: 43

Regular expression checking parameters

I am a beginner with regexes, and I got this assignment to filter parameters with - and -- joined with multiple alnums ending with = or without it. So positive catch would be --input= or -help

Here is my custom regex

^--((\w|-)*)(=([^\s]+))?$

the whole problem is that it does not catch = or -. For e.g. -input or --input= is not caught and I have no idea why.

Upvotes: 2

Views: 203

Answers (1)

hjpotter92
hjpotter92

Reputation: 80639

Use a ? for optional second hyphen. The pattern would become:

^--?([\w-]+)(?:=(\S*))?$

PS: [^\s] is same as \S.

Changing + to * allows for empty parameter values. When you use a +, the pattern expects = character to be followed by some value as well.

Upvotes: 1

Related Questions