正则表达式实现自定义属性文件转JSON键值对（完善方案）

Got it, let's refine your regex to properly handle the whitespace around keys and equals signs. Here's a robust approach that meets all your requirements:

Regex Pattern #

\s*([^\s=]+)\s*=\s*CONSTANT\[([^\]]+)\]\s*

Pattern Breakdown #

Let's break down what each part does to make it clear:

• \s*: Matches zero or more spaces/tabs before the key (handles leading whitespace around the key).
• ([^\s=]+): Captures the actual key (any characters except spaces or equals signs, so it works even if keys have underscores/hyphens).
• \s*=\s*: Matches the equals sign with any number of spaces (or none) on either side.
• CONSTANT\[: Exact match for the CONSTANT[ prefix.
• ([^\]]+): Captures the value inside the brackets (stops at the first closing ], so it handles values with spaces too, like CONSTANT[my user name]).
• \]\s*: Matches the closing ] plus any trailing whitespace (handles spacing between multiple key-value pairs).

Replacement String #

Use this to format each match into a JSON-style pair:

"$1":"$2", 

Step-by-Step Example #

Input String: #

USERNAME = CONSTANT[myUserName] PASSWORD = CONSTANT[mypwd]

After Global Replacement: #

Make sure to enable the global replacement flag (usually g in regex engines) to process all pairs. You'll get:

"USERNAME":"myUserName", "PASSWORD":"mypwd", 

Final Touch for Valid JSON: #

Just trim the trailing comma and wrap the result in curly braces to get a proper JSON object:

{
  "USERNAME":"myUserName", 
  "PASSWORD":"mypwd"
}

Quick Notes #

• If your regex tool doesn't support global replacement, you can run the replace operation multiple times until no more matches are found.
• This pattern works for both single-line inputs (multiple pairs) and multi-line inputs (one pair per line).

内容的提问来源于stack exchange，提问作者RajKon