ruby regex - how to match everything up till the character -

given a string as follow:

randomstring1-randomstring2-3df83eeff2

How can I use a ruby regex or some other ruby/r开发者_运维问答ails friendly method to find everything up until the first dash -

In the example above that would be: randomstring1

Thanks

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You can use this pattern: ^[^\-]*

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mystring = "randomstring1-randomstring2-3df83eeff2"
firstPart = mystring[0, mystring.index("-")]

Otherwise, I think the best regex is @polishchuk's.

It matches from the beginning of the string, matches as many as possible of anything that is not a dash -.

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Using irb you can do this too:

>> a= "randomstring1-randomstring2-3df83eeff2"
=> "randomstring1-randomstring2-3df83eeff2"
>> a.split('-').first
=> "randomstring1"
>> 

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For this situation, the index solution given by agent-j is probably better. If you did want to use regular expressions, the following non-greedy (specified by the ?) regex would grab it:

(^.*?)-

You can see it in Rubular.