Help with Regular Expressions

I have some sample code for string editing using regular expressions but I'm a little confused as to it's behavior. Here's what I have:
public class WordFixer
    protected final String PUNC_MATCH = "[\\d\\p{Punct}]+";
    protected final String PUNC_PREFIX = "^" + PUNC_MATCH;
    protected final String PUNC_SUFFIX = PUNC_MATCH + "$";
    public String fixPrefix (String w)
        return w.replaceFirst(PUNC_PREFIX, "");
    public String fixSuffix (String w)
        return w.replaceFirst(PUNC_SUFFIX, "");
    }This replaces all leading and trailing punctuation with "" and it works. However, changing the replaceFirst's to just replace doesn't work. I don't understand why that is. Doesn't the ^ mean in the front, and doesn't the $ mean in the back, so shouldn't this work by just changing replaceFirst to replace?

JFactor2004 wrote:
I have some sample code for string editing using regular expressions but I'm a little confused as to it's behavior. Here's what I have:
public class WordFixer
protected final String PUNC_MATCH = "[\\d\\p{Punct}]+";
protected final String PUNC_PREFIX = "^" + PUNC_MATCH;
protected final String PUNC_SUFFIX = PUNC_MATCH + "$";
public String fixPrefix (String w)
return w.replaceFirst(PUNC_PREFIX, "");
public String fixSuffix (String w)
return w.replaceFirst(PUNC_SUFFIX, "");
}This replaces all leading and trailing punctuation with "" and it works. However, changing the replaceFirst's to just replace doesn't work. I don't understand why that is. The first parameter of the replaceFirst(...) is a regex-String. And the ^, $ and [...] stuff all have a special meaning in the regex language. The replace(...) method takes plain-Strings as a parameter, so the String "^\[\\d\\p{Punct}\]+" is interpreted as just that, without any special meaning.
JFactor2004 wrote:
Doesn't the ^ mean in the front, and doesn't the $ mean in the back, Yes, ^ means the start of the String (sometimes the start of a line) and $ means the end of the String (sometimes the end of a line).
JFactor2004 wrote:
so shouldn't this work by just changing replaceFirst to replace?Nope, see the explanation above.

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