RegexReplacepublic class RegexReplace extends Object | Exercise the replacement capabilities of the java.util.regex.Matcher class.
Run this code from the command line with three or more arguments.
1) First argument is a regular expression
2) Second argument is a replacement string, optionally with capture group
references ($1, $2, etc)
3) Any remaining arguments are treated as input strings to which the
regular expression and replacement strings will be applied.
The effect of calling replaceFirst() and replaceAll() for each input string
will be listed.
Be careful to quote the commandline arguments if they contain spaces or
special characters.
Created: Jan, 2001 |
| Methods Summary |
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| public static void | main(java.lang.String[] argv)
// sanity check, need at least three args
if (argv.length < 3) {
System.out.println ("usage: regex replacement input ...");
return;
}
// save the regex and replacment strings with mnemonic names
String regex = argv [0];
String replace = argv [1];
// Compile the expression, only need be done once.
Pattern pattern = Pattern.compile (regex);
// get a Matcher instance, use a dummy input string for now
Matcher matcher = pattern.matcher ("");
// print out for reference
System.out.println (" regex: '" + regex + "'");
System.out.println (" replacement: '" + replace + "'");
// For each remaining arg string, apply the regex/replacment
for (int i = 2; i < argv.length; i++) {
System.out.println ("------------------------");
matcher.reset (argv [i]);
System.out.println (" input: '"
+ argv [i] + "'");
System.out.println ("replaceFirst(): '"
+ matcher.replaceFirst (replace) + "'");
System.out.println (" replaceAll(): '"
+ matcher.replaceAll (replace) + "'");
}
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