java-正则表达式

/* * Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ import java.io.Console; import java.util.regex.Pattern; import java.util.regex.Matcher; import java.util.regex.PatternSyntaxException; public class RegexTestHarness2 { public static void main(String[] args){ Pattern pattern = null; Matcher matcher = null; Console console = System.console(); if (console == null) { System.err.println("No console."); System.exit(1); } while (true) { try{ pattern = Pattern.compile(console.readLine("%nEnter your regex: ")); matcher = pattern.matcher(console.readLine("Enter input string to search: ")); } catch(PatternSyntaxException pse){ console.format("There is a problem with the regular expression!%n"); console.format("The pattern in question is: %s%n",pse.getPattern()); console.format("The description is: %s%n",pse.getDescription()); console.format("The message is: %s%n",pse.getMessage()); console.format("The index is: %s%n",pse.getIndex()); System.exit(0); } boolean found = false; while (matcher.find()) { console.format("I found the text \"%s\" starting at " + "index %d and ending at index %d.%n", matcher.group(), matcher.start(), matcher.end()); found = true; } if(!found){ console.format("No match found.%n"); } } } }