Change numbers in NSString

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i working on blog app. parse rss feed , take 1 of item elements , build html string. have leave uiwebview scales fit turned off, or text gets shoved 1 page, , small read. if turn on scales fit on uiwebview, text perfect, if larger pictures in blog, stretch off width of page. 1 such picture is

img class="aligncenter size-full wp-image-4532" title="father_and_daughter_1" src="http://treymorgan.net/wp-content/uploads/2012/06/father_and_daughter_1.jpg" alt="" width="590" height="342" /

in case, width goes beyond 320px. there way use regex or detect if width greater 320, , if so, have replace width , height fit?
 

change numbers in nsstring

i'm having issue replacing string occurence of string methods
string want change is:

<img class="alignleft size-full wp-image-4539" title="divorce" src="http://treymorgan.net/wp-content/uploads/2012/06/divorce.jpg" alt="" width="226" height="170" />

want replace width , height numbers standard set...any suggestions?
 


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