Conditional regex string substitution in Ruby (on Rails)

Question

I have a string that can either be something like

create

or

create by

depending on the verb, etc. In Ruby (on Rails) to get the past tense

string.sub(/e?$/, "ed")

or

string.sub(/ by?$/, "ed by")

works, but is there any way to combine the two? With some type of conditional statement or similar.

check this out - github.com/rossmeissl/verbs

Arup Rakshit
– Arup Rakshit

2014-01-03 19:53:32 +00:00
Commented Jan 3, 2014 at 19:53 — Arup Rakshit
– Arup Rakshit, Commented Jan 3, 2014 at 19:53

falsetru · Accepted Answer · 2014-01-03 19:52:46Z

6

Using word boundary (\b):

'create by'.sub(/e\b/, 'ed')
# => "created by"
'create'.sub(/e\b/, 'ed')
# => "created"

answered Jan 3, 2014 at 19:52

falsetru

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1 Comment

jiku Over a year ago

Thanks! I forgot to add that the verb can end with anything. I have hacked it to work with sub(/(e?$| )\b/, "ed "). I just don't like the space at the end of the replacement.

Danil Speransky · Accepted Answer · 2014-01-03 19:52:09Z

3

Why not?

2.1.0-preview2 :046 > 'create'.sub('create', 'created')
 => "created"
2.1.0-preview2 :047 > 'create by'.sub('create', 'created')
 => "created by"

And no regexps... )

answered Jan 3, 2014 at 19:52

Danil Speransky

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