正则表达式以提取特定分号后的数字

Question

Can you help me to write an expression for the following string:

Multi 3620 IDS; 17120846;9;12.04.2018 
14:09:02;8,531;;pH;24,1;°C;Temp;AR;60%;;SenTix 940; C171412055;

How to get just the number 8,531 using a regular expression?

Is there any rule to extract the numbers after a specific number of semicolons?

Thank you

Answer 1

No regex solution

Personally, I wouldn't even use regex for this:

See code in use here

import re

s = "Multi 3620 IDS; 17120846;9;12.04.2018 \n14:09:02;8,531;;pH;24,1;°C;Temp;AR;60%;;SenTix 940; C171412055;"
print(s.split(";")[4])

---

Regex solution

But if you must use regex (for some unknown reason) you can use the following

See regex in use here

(?:[^;]*;){4}([^;]+)

• (?:[^;]*;){4} Match the following exactly 4 times
  • [^;]* Match any character except ; any number of times
  • ; Match this literally
• ([^;]+) Capture any character except ; one or more times into capture group 1

See code in use here

import re

s = "Multi 3620 IDS; 17120846;9;12.04.2018 \n14:09:02;8,531;;pH;24,1;°C;Temp;AR;60%;;SenTix 940; C171412055;"
r = re.compile("(?:[^;]*;){4}([^;]+)")
m = r.match(s)
if m:
    print(m.group(1))