Here you can find the source of toFilename(String s)
public static String toFilename(String s)
//package com.java2s; /* Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License./*from w w w . j ava 2s.c o m*/ */ public class Main { /** * Invokes toLowerCase(), converts all whitespaces to underscores and * removes all characters other than a-z, 0-9, dot, underscore or minus. */ public static String toFilename(String s) { s = s.toLowerCase(); s = s.replaceAll("\\s+", "_"); s = s.replaceAll("[^a-z_0-9.-]", ""); return s; } }