/*
 * The MIT License
 *
 *  Copyright (c) 2012, benas (md.benhassine@gmail.com)
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */

package net.benas.cb4j.core.validator;

import net.benas.cb4j.core.api.FieldValidator;
import net.benas.cb4j.core.model.Field;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Regular expression validator implementation.<br/>
 * This validator should be used to validate field content against a regular expression
 * @author benas (md.benhassine@gmail.com)
 */
public class RegExpFieldValidator implements FieldValidator {

    /**
     * The regular expression to check the value against.
     */
    private String regexp;

    public RegExpFieldValidator(String regexp) {
        this.regexp = regexp;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isValidField(final Field field) {
        CharSequence inputStr = field.getContent();
        Pattern pattern = Pattern.compile(regexp, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);
        return matcher.matches();
    }

    /**
     * {@inheritDoc}
     */
    public String getValidationRuleDescription() {
        return "The field content should match the regular expression = '" + regexp + "'";
    }

}

/*
 * The MIT License
 *
 *  Copyright (c) 2012, benas (md.benhassine@gmail.com)
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */

package net.benas.cb4j.core.validator;

import net.benas.cb4j.core.api.FieldValidator;
import net.benas.cb4j.core.model.Field;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Regular expression validator implementation.<br/>
 * This validator should be used to validate field content against a regular expression
 * @author benas (md.benhassine@gmail.com)
 */
public class RegExpFieldValidator implements FieldValidator {

    /**
     * The regular expression to check the value against.
     */
    private String regexp;

    public RegExpFieldValidator(String regexp) {
        this.regexp = regexp;
    }

    /**
     * {@inheritDoc}
     */
    public boolean isValidField(final Field field) {
        String inputStr = field.getContent();
        return inputStr.matches(regexp);
    }

    /**
     * {@inheritDoc}
     */
    public String getValidationRuleDescription() {
        return "The field content should match the regular expression = '" + regexp + "'";
    }

}

Update cb4j-core/src/main/java/net/benas/cb4j/core/validator/RegExpFieldValidator.java