技术问询：合并正则表达式并直接移除货币符号与逗号提取数字

Absolutely! You can tweak your code to get the target numeric value in one go, skipping the manual comma removal step. Here are a few practical approaches:

Method 1: Two-step replaceAll (Simple & Readable) #

This approach breaks the problem into easy-to-understand steps: first strip out currency symbols and other non-essential characters, then remove commas.

String str = "Fr.-145,000.01";
// Step 1: Remove everything except digits, negative sign, decimal point, and commas
String cleanedSymbols = str.replaceAll("[^0-9\\-\\.,]", "");
// Step 2: Remove all commas from the remaining string
String finalResult = cleanedSymbols.replaceAll(",", "");
System.out.println(finalResult); // Output: -145000.01

Method 2: Single replaceAll (One-step Cleanup) #

If you prefer to do it in a single line, you can use a regex that matches both currency symbols and commas, replacing them all with empty strings in one pass.

The regex [^0-9\\-.]|, targets two types of characters:

• Any character that isn't a digit, negative sign, or decimal point (this catches currency symbols like Fr.)
• Commas, which we want to remove regardless of their position

String str = "Fr.-145,000.01";
String finalResult = str.replaceAll("[^0-9\\-.]|,", "");
System.out.println(finalResult); // Output: -145000.01

Method 3: Adjust Your Original Group Matching #

If you want to stick with your initial pattern-matching approach, you can modify it to first capture the numeric string (including commas) and then strip out commas from the captured group:

String str = "Fr.-145,000.01";
String pattern = "^[^0-9\\-]*([0-9\\-\\.,]*?)[^0-9\\-]*$";
Pattern p = Pattern.compile(pattern);
Matcher m = p.matcher(str);
if(m.matches()) {
    // Remove commas from the captured group
    String finalResult = m.group(1).replaceAll(",", "");
    System.out.println(finalResult); // Output: -145000.01
}

Recommendation #

Methods 1 and 2 are generally better choices because they're more concise, easier to maintain, and avoid the complexity of dealing with capture groups for this use case.

内容的提问来源于stack exchange，提问作者X.walt