CODEWITHSUNDEEP
htmlruby-on-railsrubyregex
Katie H
Katie H

Reputation: 2293

Regular expression query/replacement - Ruby

I have a set of HTML, where I am looking to scan for each instance of "img src" and replace the value of "src", which is in this instance "cid:ii_151afcf74cab7d3b" with a variable. The content of "src" will vary for each instance. How would I do this with a regular expression?

<img src="cid:ii_1w1afcd4cab7d3b" alt="Inline image 1" width="517" height="291">

Upvotes: 0

Views: 68

Answers (2)

Nermin
Nermin

Reputation: 6100

Expression:

/(?<=src=")([^"]+)/ will match your src content without the " sign

(?<=src=") is positive look-behind, will match but not take into consideration

([^"]+) match anything except ", it will match everything you throw at it inside that your src="will_match_whatever_except_double_quotes"

Live

Upvotes: 2

R. Peereboom
R. Peereboom

Reputation: 213

You can do interpolation in regular expressions just like you can in strings and symbols:

str = 'foo<img src="bar" alt="Inline image 1" width="517" height="291">'
src = /<img src="#{src}" alt="Inline image 1" width="517" height="291">/

str =~ src #=> 4

Edit: I forgot that since you are looking to replace, you will need to use String#gsub/String#gsub! or if you want to do something fancy, maybe String#scan

Upvotes: 1

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