CODEWITHSUNDEEP
ruby-on-railsrubyregexstring
Selim Alawwa
Selim Alawwa

Reputation: 762

Regex Ruby - String not followed by a "/"

I need to match a url path with that contain any of 2 words vendor_tracks or shop_types, but shop types should be followed by a ' / '

My current REGEX is

//(vendor_tracks|shop_types)/

, but this match if contain shop_types/22

I need my Regex to match something like :

/shop_types?q%5Btrack_department

but NOT the below url

/shop_types/27/list_pinned_vendors

My current accepts both, while I need it to accept only the first. I tried many different methods to exclude the "shop_types" followed by / but always get escaped backslash error. Any solution for this? or alternative REGEX

Upvotes: 2

Views: 364

Answers (1)

Sundeep
Sundeep

Reputation: 23667

You can use lookarounds to create custom restrictions

>> str1 = '/shop_types?q%5Btrack_department'
=> "/shop_types?q%5Btrack_department"
>> str2 = '/shop_types/27/list_pinned_vendors'
=> "/shop_types/27/list_pinned_vendors"

>> str1.match?(/shop_types(?!\/)/)
=> true
>> str2.match?(/shop_types(?!\/)/)
=> false

Here (?!\/) is negative lookahead which says that / character cannot be immediate character after shop_types

Note that end of string will also satisfy this condition as that would imply that there is no / character after shop_types


I tried many different methods to exclude the "shop_types" followed by / but always get escaped backslash error

You can use %r to define a regexp with alternate delimiters

# here the condition has also been changed
# restriction is that / shouldn't occur anywhere after matching shop_types
>> str1.match?(%r{shop_types(?!.*/)})
=> true
>> str2.match?(%r{shop_types(?!.*/)})
=> false

Upvotes: 2

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