Python中的正则表达式和替换

我有一个内容字符串，如：

content =
"""
the patient monitoring system shall perform a daily device check from 1:30 am to 4:30 am (patient local time). if a device malfunction is detected, the daily device check shall send the malfunction to the clinician. if a patient health alarm is detected, the daily device check shall turn into full interrogation as specified in srs-3003. if no device or patient health issue identified, the daily device check shall end without further notification to the clinicians or patient. if a scheduled interrogation happens on the same day, the daily device check shall be skipped. if any device issue detected during the daily device check, the patient monitoring system shall alarm the patient with red urgent light. . if any patient health issue detected during the daily device check, the patient monitoring system shall alarm the patient with yellow warning light. . if a daily device check fails, it should be retried in 15 minutes up to 3 times. if a daily device check still fails after 3 times, the patient monitoring system shall end the interrogation and notify patient of the failed device check at 8 am that morning. there are 3 types of interrogations as below:
1. scheduled interrogation.
2. daily device check
3. patient initiated interrogation. an interrogation could fail due to the following reasons:
1. failed to establish communication.
2. communication lost.
3. failed to obtain a key data from the implanted device.
"""

我想把分目改成1。2.3.等等，但不想影响像srs-3003这样的实际内容编号

如果我使用以下正则表达式：

re.findall（“\d{1}\”，内容）

结果是

['3'，'1'，'2'，'3'，'1'，'2'，'3.]

和srs-300中的“3”。将在下一步的内容中替换：

num_dot = re.findall("\d+\.", content)
for num in num_dot:
    content = content.replace(num, "")

---

我如何继续？

您的正则表达式达到了标准。只是为了不匹配

srs-3003.

中的

3.

，您可以添加

^

锚定。比如：

^\d+\.

对上述正则表达式的解释：

import re

regex = r"^\d+\."

test_str = ("the patient monitoring system shall perform a daily device check from 1:30 am to 4:30 am (patient local time). if a device malfunction is detected, the daily device check shall send the malfunction to the clinician. if a patient health alarm is detected, the daily device check shall turn into full interrogation as specified in srs-3003. if no device or patient health issue identified, the daily device check shall end without further notification to the clinicians or patient. if a scheduled interrogation happens on the same day, the daily device check shall be skipped. if any device issue detected during the daily device check, the patient monitoring system shall alarm the patient with red urgent light. . if any patient health issue detected during the daily device check, the patient monitoring system shall alarm the patient with yellow warning light. . if a daily device check fails, it should be retried in 15 minutes up to 3 times. if a daily device check still fails after 3 times, the patient monitoring system shall end the interrogation and notify patient of the failed device check at 8 am that morning. there are 3 types of interrogations as below:\n"
    "1. scheduled interrogation.\n"
    "2. daily device check\n"
    "3. patient initiated interrogation. an interrogation could fail due to the following reasons:\n"
    "1. failed to establish communication.\n"
    "2. communication lost.\n"
    "3. failed to obtain a key data from the implanted device.")

subst = ""

# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0, re.MULTILINE)

if result:
    print (result)

• ^

  -表示行的开始

• \d+

  -表示数字类A出现一次或多次

• \.

  -按字面意思匹配
  如果要删除每个编号点线前面的空间；请使用

  +

  或

  \s+

您可以在中找到上述正则表达式的演示

---

Python中的示例实现：

import re

regex = r"^\d+\."

test_str = ("the patient monitoring system shall perform a daily device check from 1:30 am to 4:30 am (patient local time). if a device malfunction is detected, the daily device check shall send the malfunction to the clinician. if a patient health alarm is detected, the daily device check shall turn into full interrogation as specified in srs-3003. if no device or patient health issue identified, the daily device check shall end without further notification to the clinicians or patient. if a scheduled interrogation happens on the same day, the daily device check shall be skipped. if any device issue detected during the daily device check, the patient monitoring system shall alarm the patient with red urgent light. . if any patient health issue detected during the daily device check, the patient monitoring system shall alarm the patient with yellow warning light. . if a daily device check fails, it should be retried in 15 minutes up to 3 times. if a daily device check still fails after 3 times, the patient monitoring system shall end the interrogation and notify patient of the failed device check at 8 am that morning. there are 3 types of interrogations as below:\n"
    "1. scheduled interrogation.\n"
    "2. daily device check\n"
    "3. patient initiated interrogation. an interrogation could fail due to the following reasons:\n"
    "1. failed to establish communication.\n"
    "2. communication lost.\n"
    "3. failed to obtain a key data from the implanted device.")

subst = ""

# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0, re.MULTILINE)

if result:
    print (result)

---

请在

中找到上述程序的运行示例，您的正则表达式已达到要求。只是为了不匹配

srs-3003.

中的

3.

，您可以添加

^

锚定。比如：

^\d+\.

对上述正则表达式的解释：

import re

regex = r"^\d+\."

test_str = ("the patient monitoring system shall perform a daily device check from 1:30 am to 4:30 am (patient local time). if a device malfunction is detected, the daily device check shall send the malfunction to the clinician. if a patient health alarm is detected, the daily device check shall turn into full interrogation as specified in srs-3003. if no device or patient health issue identified, the daily device check shall end without further notification to the clinicians or patient. if a scheduled interrogation happens on the same day, the daily device check shall be skipped. if any device issue detected during the daily device check, the patient monitoring system shall alarm the patient with red urgent light. . if any patient health issue detected during the daily device check, the patient monitoring system shall alarm the patient with yellow warning light. . if a daily device check fails, it should be retried in 15 minutes up to 3 times. if a daily device check still fails after 3 times, the patient monitoring system shall end the interrogation and notify patient of the failed device check at 8 am that morning. there are 3 types of interrogations as below:\n"
    "1. scheduled interrogation.\n"
    "2. daily device check\n"
    "3. patient initiated interrogation. an interrogation could fail due to the following reasons:\n"
    "1. failed to establish communication.\n"
    "2. communication lost.\n"
    "3. failed to obtain a key data from the implanted device.")

subst = ""

# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0, re.MULTILINE)

if result:
    print (result)

• ^

  -表示行的开始

• \d+

  -表示数字类A出现一次或多次

• \.

  -按字面意思匹配
  如果要删除每个编号点线前面的空间；请使用

  +

  或

  \s+

您可以在中找到上述正则表达式的演示

---

Python中的示例实现：

import re

regex = r"^\d+\."

test_str = ("the patient monitoring system shall perform a daily device check from 1:30 am to 4:30 am (patient local time). if a device malfunction is detected, the daily device check shall send the malfunction to the clinician. if a patient health alarm is detected, the daily device check shall turn into full interrogation as specified in srs-3003. if no device or patient health issue identified, the daily device check shall end without further notification to the clinicians or patient. if a scheduled interrogation happens on the same day, the daily device check shall be skipped. if any device issue detected during the daily device check, the patient monitoring system shall alarm the patient with red urgent light. . if any patient health issue detected during the daily device check, the patient monitoring system shall alarm the patient with yellow warning light. . if a daily device check fails, it should be retried in 15 minutes up to 3 times. if a daily device check still fails after 3 times, the patient monitoring system shall end the interrogation and notify patient of the failed device check at 8 am that morning. there are 3 types of interrogations as below:\n"
    "1. scheduled interrogation.\n"
    "2. daily device check\n"
    "3. patient initiated interrogation. an interrogation could fail due to the following reasons:\n"
    "1. failed to establish communication.\n"
    "2. communication lost.\n"
    "3. failed to obtain a key data from the implanted device.")

subst = ""

# You can manually specify the number of replacements by changing the 4th argument
result = re.sub(regex, subst, test_str, 0, re.MULTILINE)

if result:
    print (result)

请在

中找到上述程序的示例运行，您需要

re.sub（“\d+\”，“”，content）

not

re.findall

您需要

re.sub（“\d+\”，“”，content）

not

re.findall