How to put Ruby Variable inside of Regex Code

Question

I'm running the grep method to filter by pattern matching. This is an example code.

companies.grep /city/

However, ruby isn't allowing me to input the area_code withing the block inside the rails view. Instead, I'm forced to hardcode it like so:

companies.grep /miami/

Keep in mind, city is a variable. For example,

city = miami

However, it updates. Do you know how can I pass a variable through the grep method?

Also, I tried companies.grep /#{city}/, but it didn't work

Amadan · Accepted Answer · 2014-09-10 03:39:22Z

23

companies.grep /#{city}/
# or
companies.grep Regexp.new(city)

In case of simple alpha-numeric query, this should suffice; but it is better to get into practice of escaping those, if you don't intend to have regexp operators. Thus, better version:

companies.grep /#{Regexp.escape city}/
# or
companies.grep Regexp.new(Regexp.escape city)

answered Sep 10, 2014 at 3:39

Amadan

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2 Comments

Amadan Over a year ago

Those two are equivalent. There is zero chance for /#{city}/ to fail and Regexp.new(city) to succeed, given same city (unless someone went and redefined Regexp to mess with you).

user3465296 Over a year ago

However, it did in the rails view while Regexp.new(city) succeeded

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