Ruby Is a string present within another string (using a regexp)?

Question

Is there a present? method in ruby to check if a string is present within an other? I'd want to return as soon as a match is found since I will be checking for multiple substrings. Thanks!

possible duplicate of How to find substring in ruby?

the Tin Man
– the Tin Man

2012-01-24 01:20:40 +00:00
Commented Jan 24, 2012 at 1:20 — the Tin Man
– the Tin Man, Commented Jan 24, 2012 at 1:20

Rob Di Marco · Accepted Answer · 2012-01-23 22:23:02Z

2

I believe you mean include?

answered Jan 23, 2012 at 22:23

Rob Di Marco

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Gabe Kopley · Accepted Answer · 2012-01-23 23:12:10Z

1

I believe you are looking for include?

"ab123de".include?("123")

edited Jan 23, 2012 at 23:12

Gabe Kopley

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answered Jan 23, 2012 at 22:24

Justin Pihony

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Adam Pope · Accepted Answer · 2012-01-23 22:23:31Z

0

include?

http://ruby-doc.org/core-1.9.3/String.html#method-i-include-3F

answered Jan 23, 2012 at 22:23

Adam Pope

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Community · Accepted Answer · 2020-06-20 09:12:55Z

0

Sorry, found what i was looking for (because of the use of regexp):

index(regexp [, offset]) → fixnum or nil

Returns the index of the first occurrence of the given substring or pattern (regexp) in str. Returns nil if not found.

"hello".index('lo')            #=> 3
"hello".index('a')             #=> nil
"hello".index(?e)              #=> 1
"hello".index(/[aeiou]/, -3)   #=> 4

http://ruby-doc.org/core-1.9.3/String.html

i just used a loop checking if the index is nil

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Jan 23, 2012 at 22:28

montrealmike

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2 Comments

the Tin Man Over a year ago

Just as a FYI, there are more Ruby-like ways of doing it: 'hello'['lo'] or 'hello'[/lo/].

montrealmike Over a year ago

Good to know, thanks! I think in this case i'll spend the extra 5 char nonetheless, just to make sure it's clear to everyone what is going on. EDIT: just to clarify for others 'hellohello'['lo'] => lo, not the index, but would still work since 'hell'['lo'] => nil

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