我怎么能用 perl 从这个文本中提取一些部分......我认为它的解码 json......现在我需要以这个为例：
星期日
阴天，下午有可能下雨。高18C。轻快的。来自东北的风速为 10 至 20 公里/小时。下雨的几率为 50%。”
{
"response": {
"version": "0.1"
,"termsofService": "http://www.wunderground.com/weather/api/d/terms.html"
,"features": {
"forecast10day": 1
}
}
,
"forecast":{
"txt_forecast": {
"date":"2:00 PM CEST",
"forecastday": [
{
"period":0,
"icon":"chancerain",
"icon_url":"http://icons-ak.wxug.com/i/c/k/chancerain.gif",
"title":"Sunday",
"fcttext":"Overcast with a chance of rain in the afternoon. High of 64F. Winds from the NE at 5 to 15 mph. Chance of rain 50%.",
"fcttext_metric":"Overcast with a chance of rain in the afternoon. High of 18C. Breezy. Winds from the NE at 10 to 20 km/h. Chance of rain 50%.",
"pop":"50"
}
,
{
"period":1,
"icon":"chancerain",
"icon_url":"http://icons-ak.wxug.com/i/c/k/chancerain.gif",
"title":"Sunday Night",
"fcttext":"Overcast with a chance of rain. Low of 50F. Winds from the NNE at 5 to 10 mph. Chance of rain 50%.",
"fcttext_metric":"Overcast with a chance of rain. Low of 10C. Winds from the NNE at 10 to 15 km/h. Chance of rain 50%.",
"pop":"50"
}
,
{
"period":2,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Monday",
"fcttext":"Partly cloudy with a chance of rain. High of 64F. Winds from the SE at 5 to 10 mph. Chance of rain 20%.",
"fcttext_metric":"Partly cloudy with a chance of rain. High of 18C. Winds from the SE at 10 to 15 km/h.",
"pop":"20"
}
,
{
"period":3,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Monday Night",
"fcttext":"Partly cloudy with a chance of rain after midnight. Low of 48F. Winds less than 5 mph.",
"fcttext_metric":"Partly cloudy with a chance of rain after midnight. Low of 9C. Winds less than 5 km/h.",
"pop":"20"
}
,
{
"period":4,
"icon":"chancerain",
"icon_url":"http://icons-ak.wxug.com/i/c/k/chancerain.gif",
"title":"Tuesday",
"fcttext":"Overcast with a chance of rain. High of 59F. Winds from the SSE at 5 to 10 mph. Chance of rain 70%.",
"fcttext_metric":"Overcast with a chance of rain. High of 15C. Winds from the SSE at 10 to 15 km/h. Chance of rain 70%.",
"pop":"70"
}
,
{
"period":5,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Tuesday Night",
"fcttext":"Partly cloudy. Low of 48F. Winds less than 5 mph.",
"fcttext_metric":"Partly cloudy. Low of 9C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":6,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Wednesday",
"fcttext":"Partly cloudy. High of 63F. Winds from the South at 5 to 10 mph.",
"fcttext_metric":"Partly cloudy. High of 17C. Winds from the South at 5 to 15 km/h.",
"pop":"0"
}
,
{
"period":7,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Wednesday Night",
"fcttext":"Partly cloudy. Low of 46F. Winds less than 5 mph.",
"fcttext_metric":"Partly cloudy. Low of 8C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":8,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Thursday",
"fcttext":"Partly cloudy. High of 66F. Winds from the SSE at 5 to 10 mph.",
"fcttext_metric":"Partly cloudy. High of 19C. Winds from the SSE at 10 to 15 km/h.",
"pop":"0"
}
,
{
"period":9,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Thursday Night",
"fcttext":"Partly cloudy. Low of 52F. Winds less than 5 mph.",
"fcttext_metric":"Partly cloudy. Low of 11C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":10,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Friday",
"fcttext":"Partly cloudy. High of 66F. Winds from the SSE at 5 to 10 mph.",
"fcttext_metric":"Partly cloudy. High of 19C. Winds from the SSE at 10 to 15 km/h.",
"pop":"0"
}
,
{
"period":11,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Friday Night",
"fcttext":"Partly cloudy. Low of 48F. Winds less than 5 mph.",
"fcttext_metric":"Partly cloudy. Low of 9C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":12,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Saturday",
"fcttext":"Clear. High of 66F. Winds from the South at 5 to 10 mph.",
"fcttext_metric":"Clear. High of 19C. Winds from the South at 10 to 15 km/h.",
"pop":"0"
}
,
{
"period":13,
"icon":"clear",
"icon_url":"http://icons-ak.wxug.com/i/c/k/clear.gif",
"title":"Saturday Night",
"fcttext":"Clear. Low of 50F. Winds less than 5 mph.",
"fcttext_metric":"Clear. Low of 10C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":14,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Sunday",
"fcttext":"Clear. High of 66F. Winds less than 5 mph.",
"fcttext_metric":"Clear. High of 19C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":15,
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"title":"Sunday Night",
"fcttext":"Partly cloudy. Low of 52F. Winds less than 5 mph.",
"fcttext_metric":"Partly cloudy. Low of 11C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":16,
"icon":"clear",
"icon_url":"http://icons-ak.wxug.com/i/c/k/clear.gif",
"title":"Monday",
"fcttext":"Clear. High of 68F. Winds less than 5 mph.",
"fcttext_metric":"Clear. High of 20C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":17,
"icon":"clear",
"icon_url":"http://icons-ak.wxug.com/i/c/k/clear.gif",
"title":"Monday Night",
"fcttext":"Clear. Low of 52F. Winds less than 5 mph.",
"fcttext_metric":"Clear. Low of 11C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":18,
"icon":"mostlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/mostlycloudy.gif",
"title":"Tuesday",
"fcttext":"Mostly cloudy. High of 68F. Winds less than 5 mph.",
"fcttext_metric":"Mostly cloudy. High of 20C. Winds less than 5 km/h.",
"pop":"0"
}
,
{
"period":19,
"icon":"chancerain",
"icon_url":"http://icons-ak.wxug.com/i/c/k/chancerain.gif",
"title":"Tuesday Night",
"fcttext":"Mostly cloudy with a chance of rain. Low of 52F. Winds less than 5 mph. Chance of rain 30%.",
"fcttext_metric":"Mostly cloudy with a chance of rain. Low of 11C. Winds less than 5 km/h. Chance of rain 30%.",
"pop":"30"
}
]
},
"simpleforecast": {
"forecastday": [
{"date":{
"epoch":"1365368400",
"pretty":"11:00 PM CEST on April 07, 2013",
"day":7,
"month":4,
"year":2013,
"yday":96,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Sun",
"weekday":"Sunday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":1,
"high": {
"fahrenheit":"64",
"celsius":"18"
},
"low": {
"fahrenheit":"50",
"celsius":"10"
},
"conditions":"Chance of Rain",
"icon":"chancerain",
"icon_url":"http://icons-ak.wxug.com/i/c/k/chancerain.gif",
"skyicon":"cloudy",
"pop":50,
"qpf_allday": {
"in": 0.08,
"mm": 2.0
},
"qpf_day": {
"in": 0.04,
"mm": 1.0
},
"qpf_night": {
"in": 0.06,
"mm": 1.5
},
"snow_allday": {
"in": 0,
"cm": 0
},
"snow_day": {
"in": 0,
"cm": 0
},
"snow_night": {
"in": 0,
"cm": 0
},
"maxwind": {
"mph": 11,
"kph": 18,
"dir": "NE",
"degrees": 38
},
"avewind": {
"mph": 8,
"kph": 13,
"dir": "NE",
"degrees": 44
},
"avehumidity": 55,
"maxhumidity": 67,
"minhumidity": 46
}
,
{"date":{
"epoch":"1365454800",
"pretty":"11:00 PM CEST on April 08, 2013",
"day":8,
"month":4,
"year":2013,
"yday":97,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Mon",
"weekday":"Monday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":2,
"high": {
"fahrenheit":"64",
"celsius":"18"
},
"low": {
"fahrenheit":"48",
"celsius":"9"
},
"conditions":"Chance of Rain",
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"skyicon":"partlycloudy",
"pop":20,
"qpf_allday": {
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"mm": 1.0
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"qpf_day": {
"in": 0.01,
"mm": 0.3
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"mm": 1.0
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"kph": 13,
"dir": "NNE",
"degrees": 32
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"mph": 5,
"kph": 8,
"dir": "South",
"degrees": 182
},
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"maxhumidity": 69,
"minhumidity": 42
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,
{"date":{
"epoch":"1365541200",
"pretty":"11:00 PM CEST on April 09, 2013",
"day":9,
"month":4,
"year":2013,
"yday":98,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
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"weekday":"Tuesday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
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"period":3,
"high": {
"fahrenheit":"59",
"celsius":"15"
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"low": {
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"celsius":"9"
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"conditions":"Chance of Rain",
"icon":"chancerain",
"icon_url":"http://icons-ak.wxug.com/i/c/k/chancerain.gif",
"skyicon":"cloudy",
"pop":70,
"qpf_allday": {
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"mm": 5.1
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"mm": 4.3
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"degrees": 171
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"kph": 6,
"dir": "South",
"degrees": 172
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"maxhumidity": 67,
"minhumidity": 56
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,
{"date":{
"epoch":"1365627600",
"pretty":"11:00 PM CEST on April 10, 2013",
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"month":4,
"year":2013,
"yday":99,
"hour":23,
"min":"00",
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"high": {
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"celsius":"17"
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"low": {
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"celsius":"8"
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"conditions":"Partly Cloudy",
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"skyicon":"partlycloudy",
"pop":0,
"qpf_allday": {
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"dir": "SW",
"degrees": 219
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"kph": 8,
"dir": "SSW",
"degrees": 195
},
"avehumidity": 60,
"maxhumidity": 66,
"minhumidity": 51
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,
{"date":{
"epoch":"1365714000",
"pretty":"11:00 PM CEST on April 11, 2013",
"day":11,
"month":4,
"year":2013,
"yday":100,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Thu",
"weekday":"Thursday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":5,
"high": {
"fahrenheit":"66",
"celsius":"19"
},
"low": {
"fahrenheit":"52",
"celsius":"11"
},
"conditions":"Partly Cloudy",
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"skyicon":"partlycloudy",
"pop":0,
"qpf_allday": {
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"maxwind": {
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"dir": "South",
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},
"avewind": {
"mph": 6,
"kph": 10,
"dir": "South",
"degrees": 175
},
"avehumidity": 61,
"maxhumidity": 66,
"minhumidity": 47
}
,
{"date":{
"epoch":"1365800400",
"pretty":"11:00 PM CEST on April 12, 2013",
"day":12,
"month":4,
"year":2013,
"yday":101,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
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"weekday":"Friday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":6,
"high": {
"fahrenheit":"66",
"celsius":"19"
},
"low": {
"fahrenheit":"48",
"celsius":"9"
},
"conditions":"Partly Cloudy",
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"skyicon":"partlycloudy",
"pop":0,
"qpf_allday": {
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"mm": 0.3
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"qpf_day": {
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"dir": "South",
"degrees": 182
},
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"mph": 6,
"kph": 10,
"dir": "South",
"degrees": 172
},
"avehumidity": 72,
"maxhumidity": 85,
"minhumidity": 50
}
,
{"date":{
"epoch":"1365886800",
"pretty":"11:00 PM CEST on April 13, 2013",
"day":13,
"month":4,
"year":2013,
"yday":102,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Sat",
"weekday":"Saturday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":7,
"high": {
"fahrenheit":"66",
"celsius":"19"
},
"low": {
"fahrenheit":"50",
"celsius":"10"
},
"conditions":"Partly Cloudy",
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"skyicon":"mostlysunny",
"pop":0,
"qpf_allday": {
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"mm": 0.3
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},
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"dir": "South",
"degrees": 188
},
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"maxhumidity": 82,
"minhumidity": 61
}
,
{"date":{
"epoch":"1365973200",
"pretty":"11:00 PM CEST on April 14, 2013",
"day":14,
"month":4,
"year":2013,
"yday":103,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Sun",
"weekday":"Sunday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":8,
"high": {
"fahrenheit":"66",
"celsius":"19"
},
"low": {
"fahrenheit":"52",
"celsius":"11"
},
"conditions":"Partly Cloudy",
"icon":"partlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/partlycloudy.gif",
"skyicon":"sunny",
"pop":0,
"qpf_allday": {
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},
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"kph": 3,
"dir": "SW",
"degrees": 236
},
"avehumidity": 61,
"maxhumidity": 69,
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}
,
{"date":{
"epoch":"1366059600",
"pretty":"11:00 PM CEST on April 15, 2013",
"day":15,
"month":4,
"year":2013,
"yday":104,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Mon",
"weekday":"Monday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":9,
"high": {
"fahrenheit":"68",
"celsius":"20"
},
"low": {
"fahrenheit":"52",
"celsius":"11"
},
"conditions":"Clear",
"icon":"clear",
"icon_url":"http://icons-ak.wxug.com/i/c/k/clear.gif",
"skyicon":"sunny",
"pop":0,
"qpf_allday": {
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"qpf_day": {
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"maxwind": {
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"kph": 6,
"dir": "East",
"degrees": 81
},
"avewind": {
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"kph": 3,
"dir": "South",
"degrees": 172
},
"avehumidity": 65,
"maxhumidity": 75,
"minhumidity": 53
}
,
{"date":{
"epoch":"1366146000",
"pretty":"11:00 PM CEST on April 16, 2013",
"day":16,
"month":4,
"year":2013,
"yday":105,
"hour":23,
"min":"00",
"sec":0,
"isdst":"1",
"monthname":"April",
"weekday_short":"Tue",
"weekday":"Tuesday",
"ampm":"PM",
"tz_short":"CEST",
"tz_long":"Europe/Belgrade"
},
"period":10,
"high": {
"fahrenheit":"68",
"celsius":"20"
},
"low": {
"fahrenheit":"52",
"celsius":"11"
},
"conditions":"Mostly Cloudy",
"icon":"mostlycloudy",
"icon_url":"http://icons-ak.wxug.com/i/c/k/mostlycloudy.gif",
"skyicon":"mostlycloudy",
"pop":0,
"qpf_allday": {
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"mm": 2.3
},
"qpf_day": {
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},
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"in": 0.15,
"mm": 3.8
},
"snow_allday": {
"in": 0,
"cm": 0
},
"snow_day": {
"in": 0,
"cm": 0
},
"snow_night": {
"in": 0,
"cm": 0
},
"maxwind": {
"mph": 5,
"kph": 8,
"dir": "SSW",
"degrees": 193
},
"avewind": {
"mph": 4,
"kph": 6,
"dir": "South",
"degrees": 174
},
"avehumidity": 69,
"maxhumidity": 77,
"minhumidity": 56
}
]
}
}
}