Java正则表达式问题

Question

I have as input text a big html file from where I have to extract some information using pattern matching. The "region" is somehow as follows:

 some html text
 <div debugState" style="display: none;">
            Model: ModelCode[BR324]
            Features: [S08TL, S0230, S0851, S0428, S01CD, S0879, S01CA, S08SP, S0698, S01CB, S0548, S08SC, S08TM, S01CC, S0801, S0258, P0668, S04AK]
            Packages: [S0801]
 </div>
        some html text

I wrote the following code. (At debInfo ) is the html source to be scanned. Due to

Pattern model = Pattern.compile(".*(Model: ModelCode\\[\\w\\]).*, Pattern.DOTALL");
Pattern features = Pattern.compile(".*(Features: \\[\\w*\\]).*, Pattern.DOTALL");
Pattern packages = Pattern.compile(".*(Packages: \\[\\w*\\]).*, Pattern.DOTALL");


Matcher m1 = model.matcher(debInfo);
Matcher m2 = features.matcher(debInfo);
Matcher m3 = packages.matcher(debInfo);

boolean a = m1.matches();
boolean b = m2.matches();
boolean c = m3.matches();

System.out.println("matches(); " + a + " " + b + " " + c + " " + "\n" + debInfo);

and I am getting no match :-(. What am I doing wrong? Thanks in advance (a lot!)

Answer 1

You use \\\\w inside your (correctly escaped) square brackets. That matches only a single character. Try \\\\w+ or \\\\w* instead.

Also, you have included , Pattern.DOTALL in your String literal, which I think is a typo:

Pattern model = Pattern.compile(".*(Model: ModelCode\\[\\w+\\]).*", Pattern.DOTALL);

Also note that for the comma-and-space separated list of Features \\\\w* will not work, you'll need something like [\\\\w\\\\s,]* .

Answer 2

I think you need to use:

Pattern model = Pattern.compile(".*(Model: ModelCode\\[\\w*\\]).*", Pattern.DOTALL);
Pattern features = Pattern.compile(".*(Features: \\[\\w*\\]).*", Pattern.DOTALL);
Pattern packages = Pattern.compile(".*(Packages: \\[\\w*\\]).*", Pattern.DOTALL);

Answer 3

These are the correct patterns:

Pattern modelPattern = Pattern.compile(".*Model: ModelCode\\[(\\w*)\\].*",
        Pattern.DOTALL | Pattern.MULTILINE);
Pattern featuresPattern = Pattern.compile(".*Features: \\[([\\w\\s,]*)\\].*",
        Pattern.DOTALL | Pattern.MULTILINE);
Pattern packagesPattern = Pattern.compile(".*Packages: \\[([\\w\\s,]*)\\].*",
        Pattern.DOTALL | Pattern.MULTILINE);

Answer 4

它缺少MULTILINE开关。

 Pattern modelPattern = Pattern.compile(".*(Model: ModelCode\\[\\w*\\]).*", Pattern.DOTALL | Pattern.MULTILINE);