Data commit

Task/Regular-expressions/Java/regular-expressions-1.java

@@ -0,0 +1,5 @@
+/* match entire string against a pattern */
+boolean isNumber = "-1234.567".matches("-?\\d+(?:\\.\\d+)?");
+
+/* substitute part of string using a pattern */
+String reduceSpaces = "a  b c   d e  f".replaceAll(" +", " ");

Task/Regular-expressions/Java/regular-expressions-2.java

@@ -0,0 +1,12 @@
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+...
+/* group capturing example */
+Pattern pattern = Pattern.compile("(?:(https?)://)?([^/]+)/(?:([^#]+)(?:#(.+))?)?");
+Matcher matcher = pattern.matcher("https://rosettacode.org/wiki/Regular_expressions#Java");
+if (matcher.find()) {
+    String protocol = matcher.group(1);
+    String authority = matcher.group(2);
+    String path = matcher.group(3);
+    String fragment = matcher.group(4);
+}

Task/Regular-expressions/Java/regular-expressions-3.java

@@ -0,0 +1,2 @@
+/* split a string using a pattern */
+String[] strings = "abc\r\ndef\r\nghi".split("\r\n?");

Task/Regular-expressions/Java/regular-expressions-4.java

@@ -0,0 +1,4 @@
+String str = "I am a string";
+if (str.matches(".*string")) { // note: matches() tests if the entire string is a match
+  System.out.println("ends with 'string'");
+}

Task/Regular-expressions/Java/regular-expressions-5.java

@@ -0,0 +1,6 @@
+import java.util.regex.*;
+Pattern p = Pattern.compile("a*b");
+Matcher m = p.matcher(str);
+while (m.find()) {
+  // use m.group() to extract matches
+}

Task/Regular-expressions/Java/regular-expressions-6.java

@@ -0,0 +1,3 @@
+String orig = "I am the original string";
+String result = orig.replaceAll("original", "modified");
+// result is now "I am the modified string"