extract substring in string

Question

I have the following string:

expression_patterns_attributes_2_location_attributes_PTN_PATTERN

I need to extract only the number after 'expression_patterns_attributes_'

I did the following:

<%= string_a = "expression_patterns_attributes_2_location_attributes_PTN_PATTERN"
<% z_index1 = string_a.slice! "expression_patterns_attributes_" %>
<% z_index2 = string_a.slice! "_location_attributes_PTN_PATTERN"     %>
<%= string_a %> yields '2'

Is there a neater way of extracting the number from the string?

Thanks for your suggestion

Mori · Accepted Answer · 2012-09-25 16:45:13Z

2

s = 'expression_patterns_attributes_2_location_attributes_PTN_PATTERN'
s[/\d+/] # => "2"

answered Sep 25, 2012 at 16:45

Mori

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1 Comment

Anthony Alberto Over a year ago

Yep this is actually a lot more robust!

Anthony Alberto · Accepted Answer · 2012-09-25 16:44:20Z

1

If you're sure that string_a is always well formed :

string_a.split("_")[3]

answered Sep 25, 2012 at 16:44

Anthony Alberto

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