如何用re.findall编写正则：仅匹配RPD_PC_MISC，排除RPD_PC_Basic_Sanity_ST？

If you need to only extract RPD_PC_MISC from your JSON string while excluding matches like RPD_PC_Basic_Sanity_ST, you have a couple of straightforward regex options depending on your exact needs:

Option 1: Exact Full-Word Match (Most Common) #

Use word boundaries (\b) to ensure you're matching the complete RPD_PC_MISC string—this prevents accidental partial hits like XRPD_PC_MISC or RPD_PC_MISCY:

import re

json_content = '''
{
  "test1": "RPD_PC_MISC",
  "test2": "RPD_PC_Basic_Sanity_ST",
  "test3": "Random text with RPD_PC_MISC embedded",
  "test4": "RPD_PC_MISC_extra"
}
'''

# Regex pattern with word boundaries to enforce full-word match
pattern = r'\bRPD_PC_MISC\b'
matches = re.findall(pattern, json_content)

print(matches)  # Output: ['RPD_PC_MISC', 'RPD_PC_MISC']

Option 2: Exclude Suffix Underscores (If Needed) #

If you also want to exclude cases where RPD_PC_MISC is followed by an underscore (like RPD_PC_MISC_extra), add a negative lookahead ((?!_)) to block unwanted extensions right after the match:

# Regex pattern to exclude underscore suffixes
pattern = r'RPD_PC_MISC(?!_)'
matches = re.findall(pattern, json_content)

print(matches)  # Output: ['RPD_PC_MISC', 'RPD_PC_MISC'] (excludes test4's entry)

Why This Works #

• The original broad pattern RPD_PC_\w+ matches any word characters (including underscores) after RPD_PC_, which is why it catches unwanted strings like RPD_PC_Basic_Sanity_ST.
• Our targeted patterns explicitly lock in MISC as the only valid suffix: word boundaries ensure it's a standalone term, while the negative lookahead blocks any immediate underscore extensions.

内容的提问来源于stack exchange，提问作者om tripathi