我需要匹配Measured at X;2023/03/10 03:15:18, 00:00:16 [999] ¥;2023/03/10 03:15:35, 00:00:16 [999] Align. Decent. Free:X = 0. 5228(um) Free:¥ = 0.3051 (um) Free:Z = -0.2269(um) Align. Tilt Freeza = -0.1392(min) Free:b = -0.3905(min) — Lock:¢ = 0. 0000(min)中的Free:X = 0.3051 (um)如何用re匹配
时间: 2023-05-31 21:06:44 浏览: 38
可以使用如下正则表达式进行匹配:
r'Free:X = (\d+\.\d+)\s*\(um\)'
其中,\d+ 匹配一个或多个数字,\.\d+ 匹配一个小数点后面的数字,\s* 匹配任意个空格。括号中的内容会被提取出来作为匹配结果。
相关问题
我需要匹配Measured at X;2023/03/10 03:15:18, 00:00:16 [999] ¥;2023/03/10 03:15:35, 00:00:16 [999] Align. Decent. Free:X = 0. 5228(um) Free:¥ = 0.3051 (um) Free:Z = -0.2269(um) Align. Tilt Freeza = -0.1392(min) Free:b = -0.3905(min) — Lock:¢ = 0. 0000(min)中的Free:¥ = 0.3051 (um)如何用re匹配
可以使用以下正则表达式匹配:
```python
import re
text = "Measured at X;2023/03/10 03:15:18, 00:00:16 [999] ¥;2023/03/10 03:15:35, 00:00:16 [999] Align. Decent. Free:X = 0. 5228(um) Free:¥ = 0.3051 (um) Free:Z = -0.2269(um) Align. Tilt Freeza = -0.1392(min) Free:b = -0.3905(min) — Lock:¢ = 0. 0000(min)"
pattern = r"Free:¥ = (\d+\.\d+) \(um\)"
match = re.search(pattern, text)
if match:
print(match.group(1))
```
输出结果为:
```
0.3051
```
解释一下正则表达式:
- `Free:¥ = ` 匹配字符串 "Free:¥ = "
- `(\d+\.\d+)` 匹配一个或多个数字和一个小数点,再匹配一个或多个数字,使用括号将结果捕获为一个组
- `\(um\)` 匹配字符串 "(um)",需要使用反斜杠对括号进行转义
帮我编写MATLAB代码:4-PSK、16-PSK仿真,并与8-PSK比较
好的,下面是MATLAB代码实现4-PSK、16-PSK的仿真并与8-PSK比较的过程:
1. 生成调制信号
```
M = 4; % 4-PSK
N = 10000; % 发送符号数
data = randi([0 M-1],N,1);
txSig = pskmod(data,M);
```
```
M = 16; % 16-PSK
N = 10000; % 发送符号数
data = randi([0 M-1],N,1);
txSig = pskmod(data,M);
```
```
M = 8; % 8-PSK
N = 10000; % 发送符号数
data = randi([0 M-1],N,1);
txSig = pskmod(data,M);
```
2. 添加高斯白噪声
```
snr = 10; % 信噪比(dB)
rxSig = awgn(txSig,snr,'measured');
```
3. 解调信号
```
dataHat = pskdemod(rxSig,M);
```
4. 计算误码率
```
errorRate = comm.ErrorRate;
err = errorRate(data,dataHat);
ber = err(1);
```
5. 绘制误码率曲线
```
semilogy(snrVec,berVec);
xlabel('SNR (dB)');
ylabel('BER');
legend('4-PSK','8-PSK','16-PSK');
```
通过以上步骤,即可实现4-PSK、16-PSK的仿真,并与8-PSK比较。