Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Advanced Data/Regex/Regex.pde

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+/**
+ * Regular Expression example
+ * by Daniel Shiffman.  
+ * 
+ * This example demonstrates how to use matchAll() to create
+ * a list of all matches of a given regex.
+ *
+ * Here we'll load the raw HTML from a URL and search for any
+ * <a href=" "> links
+ */
+
+// Our source url
+String url = "http://processing.org";
+// We'll store the results in an array
+String[] links;
+
+void setup() {
+  size(640, 360);
+  // Load the links
+  links = loadLinks(url);
+}
+
+void draw() {
+  background(0);
+  // Display the raw links
+  fill(255);
+  for (int i = 0; i < links.length; i++) {
+    text(links[i],10,16+i*16);
+  }
+}
+
+String[] loadLinks(String s) {
+  // Load the raw HTML
+  String[] lines = loadStrings(s);
+  // Put it in one big string
+  String html = join(lines,"\n");
+  
+  // A wacky regex for matching a URL
+  String regex = "<\\s*a\\s+href\\s*=\\s*\"(.*?)\"";
+  // The matches are in a two dimensional array
+  // The first dimension is all matches
+  // The second dimension is the groups
+  String[][] matches = matchAll(html, regex);
+  
+  // An array for the results
+  String[] results = new String[matches.length];
+  
+  // We want group 1 for each result
+  for (int i = 0; i < results.length; i++) {
+     results[i] = matches[i][1];
+  }
+  
+  // Return the results
+  return results;
+}
+