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53 lines
1.7 KiB
53 lines
1.7 KiB
// RegexHelper.java
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// ------------------------
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// part of YaCy
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// (C) by Marc Nause; marc.nause@gmx.de
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// first published on http://www.anomic.de
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// Braunchweig, Germany, 2011
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.repository;
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import java.util.regex.Pattern;
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import java.util.regex.PatternSyntaxException;
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public final class RegexHelper {
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/** Private constructor to avoid instantiation of static class. */
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private RegexHelper() { }
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/**
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* Checks if a given expression is a valid regular expression.
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* @param expression expression to be checked
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* @return true if the expression is a valid regular expression, else false
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*/
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public static boolean isValidRegex(final String expression) {
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boolean ret = true;
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try {
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Pattern.compile(expression);
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} catch (final PatternSyntaxException e) {
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ret = false;
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}
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return ret;
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}
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}
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