I've a text document from which I want to extract URLs and place them in a new text file. How can I do that in Perl? A sample of the text file is here:

> 
> {"type":"TabGroupsManager:GroupData","id":65,"name":"XML
>  Schema
>  Editor","image":"http://www.altova.com/favicon.ico","disableAutoRename":false,"titleList":"XML
>  Schema Editor\u000aAltova XMLSpy Code
>  Generation\u000aOnline Video
>  Demos\u000aScheduled Data Exchange
>  Case Study\u000aXML Editor\u000aAltova
>  XMLSpy 2011\u000aXML Schema Management
>  Tool\u000a","tabs":["{\"entries\":[{\"url\":\"http://www.altova.com/xmlspy/xml-schema-editor.html\",\"title\":\"XML
>  Schema
>  Editor\",\"ID\":1442422751,\"referrer\":\"http://www.altova.com/xmlspy/xml-editing.html\",\"scroll\":\"0,0\",\"formdata\":{\"#q\":\"\"}}],\"index\":1,\"attributes\":{\"image\":\"http://www.altova.com/favicon.ico\"},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}","{\"entries\":[{\"url\":\"http://www.altova.com/xmlspy/xml-code-generation.html\",\"title\":\"Altova
>  XMLSpy Code
>  Generation\",\"ID\":1442423118,\"referrer\":\"http://www.google.com/search?hl=en&client=firefox-a&hs=GR1&rls=org.mozilla%3Aen-GB%3Aofficial&q=altova+derive+schema+from+xml&aq=f&aqi=m1&aql=&oq=&gs\_rfai=\",\"scroll\":\"0,0\",\"formdata\":{\"#q\":\"\"}}],\"index\":1,\"attributes\":{\"image\":\"http://www.altova.com/favicon.ico\"},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}","{\"entries\":[{\"url\":\"http://www.altova.com/videos.asp?type=0&video=xmlspy\",\"title\":\"Online
>  Video
>  Demos\",\"ID\":1442423184,\"referrer\":\"http://www.altova.com/xmlspy/xml-code-generation.html\",\"scroll\":\"0,0\",\"formdata\":{\"#q\":\"\"}}],\"index\":1,\"attributes\":{\"image\":\"http://www.altova.com/favicon.ico\"},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}","{\"entries\":[{\"url\":\"http://www.altova.com/solutions/exchange\_ratecasestudy.html\",\"title\":\"Scheduled
>  Data Exchange Case
>  Study\",\"ID\":2618,\"formdata\":{\"#q\":\"\"},\"scroll\":\"0,1369\"}],\"index\":1,\"attributes\":{\"image\":\"http://www.altova.com/favicon.ico\"},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}","{\"entries\":[{\"url\":\"http://www.altova.com/xml-editor/\",\"title\":\"XML
>  Editor\",\"ID\":2620,\"formdata\":{\"#q\":\"\"},\"scroll\":\"0,0\"}],\"index\":1,\"attributes\":{\"image\":\"http://www.altova.com/favicon.ico\"},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}","{\"entries\":[{\"url\":\"http://manual.altova.com/XMLSpy/spystandard/index.html?xmlschemasstd.htm\",\"title\":\"Altova
>  XMLSpy
>  2011\",\"ID\":2622,\"children\":[{\"url\":\"http://manual.altova.com/XMLSpy/spystandard/xmlspy\_content\_dyn.html\",\"title\":\"Altova XMLSpy
>  2011\",\"ID\":2623,\"referrer\":\"http://manual.altova.com/XMLSpy/spystandard/index.html?xmlschemasstd.htm\",\"scroll\":\"0,0\"},{\"url\":\"http://manual.altova.com/XMLSpy/spystandard/xmlschemasstd.htm\",\"title\":\"XML
>  Schemas\",\"ID\":2624,\"referrer\":\"http://manual.altova.com/XMLSpy/spystandard/index.html?xmlschemasstd.htm\",\"scroll\":\"0,260\"}],\"scroll\":\"0,0\"}],\"index\":1,\"attributes\":{},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}","{\"entries\":[{\"url\":\"http://www.altova.com/schemaagent.html\",\"title\":\"XML
>  Schema Management
>  Tool\",\"ID\":2626,\"formdata\":{\"#q\":\"\"},\"scroll\":\"0,171\"}],\"index\":1,\"attributes\":{\"image\":\"http://www.altova.com/favicon.ico\"},\"extData\":{\"TabGroupsManagerGroupId\":\"65\",\"TabGroupsManagerGroupName\":\"XML
>  Schema
>  Editor\"},\"\_formDataSaved\":true}"]}
> 
> 
> 

From that I want to create a text file like:

```
http://www.altova.com/xmlspy/xml-schema-editor.html
http://www.altova.com/xmlspy/xml-code-generation.html

```