Replace substring with another string rails

Question

In my rails app, I am saving a question as html. For example,

"<p>&lt;pre dir=\"ltr\" style=\"background-color: #ede7db; color:
#000000; margin: 0px; padding: 6px; border: 1px inset; width: 640px; height: 194px; text-align: left; overflow: auto; background-position: initial initial; background-repeat: initial initial;\" class=\"alt2\"&gt;void myFunc (int x) <br />{ <br /> if (x &amp;gt; 0)<br /> myFunc(--x); <br /> printf(\"%d, \", x); <br />} <br />int main() <br />{ <br /> myFunc(5); <br /> return 0; <br />}&lt;/pre&gt;</p>"

I need to replace all the width attributes with width:auto;

Help me to do the same. Thanks :)-

You seem to have some serious issues with some escaping here (< etc). — harm
– harm, Commented Feb 26, 2013 at 13:25

alexsanford1 · Accepted Answer · 2015-09-08 13:46:14Z

5

Try this, assuming the string is in a variable s:

s.gsub(/width:[^;]*;/, 'width: auto;')

edited Sep 8, 2015 at 13:46

answered Feb 26, 2013 at 13:27

alexsanford1

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4 Comments

Chirag Bhatia - chirag64 Over a year ago

I think you need to add the global flag in your regex so that it replaces 'all' width attributes.

alexsanford1 Over a year ago

gsub does this by default: ruby-doc.org/core-2.0/String.html#method-i-gsub

Chirag Bhatia - chirag64 Over a year ago

Ahh, you're right. I didn't notice you used gsub instead of sub. :)

the Tin Man Over a year ago

@Chirag64, Ruby doesn't have a "global flag" for regex patterns. Perhaps you're confusing Ruby and Perl or another language. gsub is the implementation of "global flag", done in a method that does search/replace globally in the String, whereas sub only does the first matching pattern.

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