Découpe de chaînes de caractères

Bonjour,

Je recherche à couper une chaîne de caractère en fonction d'une expression régulière que je recherche.

Voici un exemple pour illustrer :

La chaîne de caractère se présente de la façon suivante :

{"completed_in":0.181,"max_id":236440432937168896,"max_id_str":"236440432937168896","next_page":"?page=2&max_id=236440432937168896&q=twitter&rpp=2","page":1,"query":"twitter","refresh_url":"?since_id=236440432937168896&q=twitter","results":[{"created_at":"Fri, 17 Aug 2012 12:32:46 +0000","from_user":"dallaven","from_user_id":282052794,"from_user_id_str":"282052794","from_user_name":"Marzia Dalla Venezia","geo":{"coordinates":[44.0574,12.5859],"type":"Point"},"id":236440432937168896,"id_str":"236440432937168896","iso_language_code":"it","metadata":{"result_type":"recent"},"profile_image_url":"http:\/\/a0.twimg.com\/profile_images\/2488300023\/dbmj70vs6fsqal7zrdn1_normal.jpeg","profile_image_url_https":"https:\/\/si0.twimg.com\/profile_images\/2488300023\/dbmj70vs6fsqal7zrdn1_normal.jpeg","source":"<a href="http:\/\/twitter.com\/download\/android" rel="nofollow">Twitter for Android<\/a>","text":"Spiacenti.Interruzione imprevista dell'applicazione Twitter.Riprova.Dopo un'ora che riprovo e nn vedo gli account,auguro #FF a tutti!!!","to_user":null,"to_user_id":0,"to_user_id_str":"0","to_user_name":null}
, "la césure"
{"created_at":"Fri, 17 Aug 2012 12:32:46 +0000","from_user":"itsamytalbot","from_user_id":240780723,"from_user_id_str":"240780723","from_user_name":"Amy Talbot","geo":null,"id":236440432752599040,"id_str":"236440432752599040","iso_language_code":"en","metadata":{"result_type":"recent"},"profile_image_url":"http:\/\/a0.twimg.com\/profile_images\/2188339232\/image_normal.jpg","profile_image_url_https":"https:\/\/si0.twimg.com\/profile_images\/2188339232\/image_normal.jpg","source":"<a href="http:\/\/twitter.com\/">web<\/a>","text":"Twitter next time you suspend my account check the tweets I've been sending first","to_user":null,"to_user_id":0,"to_user_id_str":"0","to_user_name":null}],"results_per_page":2,"since_id":0,"since_id_str":"0"}

Je cherche à supprimer ce qu'y est en gras et à séparer les deux parties restantes pour avoir deux parties distinctes la césure étant une virgule souligner et en gras.

Je cherche une aide et pas une solution pour me faire avancer dans la résolution de mon problème.

Merci d'avance

Flav1313