Android String Extract regexExtract(String string, String pattern)

Description

Extracts regex match from string

Parameter

Parameter	Description
string	to search
pattern	regex pattern

Return

matched string, or null if nothing found (or null if any of the parameters is null)

Declaration

public static String regexExtract(String string, String pattern) 

Method Source Code

//package com.java2s;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    /**//www. ja  va  2 s.  c  o m
     * Extracts regex match from string
     * @param string to search
     * @param pattern regex pattern
     * @return matched string, or null if nothing found (or null if any of the parameters is null)
     */
    public static String regexExtract(String string, String pattern) {
        if (string == null || pattern == null) {
            return null;
        }

        Matcher m = regexGetMatcherForPattern(string, pattern);
        if (m == null) {
            return null;
        }

        if (m.find()) {
            return m.group(0);
        } else
            return null;
    }

    public static Matcher regexGetMatcherForPattern(String string,
            String pattern) {
        if (string == null || pattern == null) {
            return null;
        }

        /**
         * strip newline characters because it doesn't work well with this.
         */
        //    string = string.replace("\n", "");

        Pattern p = Pattern.compile(pattern, Pattern.DOTALL
                | Pattern.MULTILINE);
        Matcher m = p.matcher(string);

        return m;
    }
}