python 正则表达式分别匹配 '5 packets transmitted, 5 packets received, 0% packet loss’中packets或packet前的一个字符
时间: 2024-09-20 20:11:52 浏览: 38
在Python中,你可以使用正则表达式(regex)来匹配特定模式。对于这个例子,如果你想匹配"packets"或"packet"前面的一个字符,假设该字符可能是数字或者其他字符,你可以编写一个简单的正则表达式来查找。
例如,如果你想匹配"5 packets"中的"5",你可以使用`\d`来匹配任意一个数字;如果你想匹配"packet"前面的字母,可以使用`[^0-9]`来匹配非数字字符。组合起来,你可以这样做:
```python
import re
text = "5 packets transmitted, 5 packets received, 0% packet loss"
pattern = r"\d+ (?:\bpacket\b|\bpacket)"
match = re.search(pattern, text)
if match:
print("找到的字符:", match.group(1)) # 输出第一个捕获组的内容
else:
print("未找到匹配")
```
这里`\b`用于单词边界,防止匹配到包含"packet"的其他词中。如果只想匹配单独的"packet",去掉`\b`即可。
相关问题
python 正则表达式分别匹配 '5 packets transmitted, 5 packets received, 0% packet loss'中的 5,5%,0%
在Python中,正则表达式可以用来匹配特定模式。对于给定的字符串`'5 packets transmitted, 5 packets received, 0% packet loss'`,我们可以使用正则表达式来提取其中的数字和百分比:
1. 匹配整数(5和5):
可以使用`\d+`这个模式,它代表一串连续的数字。例如:
```python
import re
text = '5 packets transmitted, 5 packets received, 0% packet loss'
match_integers = re.findall(r'\d+', text)
print(match_integers) # 输出: ['5', '5']
```
2. 匹配百分比(0%):
对于百分比,通常会包含一个空格和百分号 `%`。我们可以使用模式`[\d]+%`来匹配:
```python
match_percent = re.search(r'([\d]+)%', text)
if match_percent:
percentage = match_percent.group(1)
print(percentage) # 输出: '0%'
```
3 packets transmitted, 3 received, 0% packet loss, time 2003ms \n rtt min/avg/max/mdev = 6.481/6.860/7.104/0.288 ms根据这个帮我写一个fsm,取0丢包,min值,max值,
以下是一个简单的FSM,用于处理收到的ping命令结果:
```python
class PingFSM:
def __init__(self):
self.state = "INIT"
self.packet_loss = None
self.rtt_min = None
self.rtt_max = None
def process_ping_output(self, output):
if self.state == "INIT":
if "0% packet loss" in output:
self.packet_loss = 0
self.state = "RTT_MIN"
elif self.state == "RTT_MIN":
match = re.search("rtt min/avg/max/mdev = (\d+\.\d+)/", output)
if match:
self.rtt_min = float(match.group(1))
self.state = "RTT_MAX"
elif self.state == "RTT_MAX":
match = re.search("rtt min/avg/max/mdev = \d+\.\d+/[\d\.]+/(\d+\.\d+)/", output)
if match:
self.rtt_max = float(match.group(1))
self.state = "DONE"
def get_results(self):
if self.state != "DONE":
return None
return {
"packet_loss": self.packet_loss,
"rtt_min": self.rtt_min,
"rtt_max": self.rtt_max
}
```
使用方法:
```python
output = "3 packets transmitted, 3 received, 0% packet loss, time 2003ms \n rtt min/avg/max/mdev = 6.481/6.860/7.104/0.288 ms"
fsm = PingFSM()
fsm.process_ping_output(output)
results = fsm.get_results()
print(results) # 输出 {"packet_loss": 0, "rtt_min": 6.481, "rtt_max": 7.104}
```
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