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Editorial Team
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Asked: 2026-06-11T08:24:49+00:00

I has found this android method TextUtils.regionMatches But for some reason, so it is

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I has found this android method TextUtils.regionMatches

But for some reason, so it is not clear how this function works.

The function can be found here:
http://developer.android.com/reference/android/text/TextUtils.html#regionMatches%28java.lang.CharSequence,%20int,%20java.lang.CharSequence,%20int,%20int%29

And the base code for this method here,
http://androidxref.com/4.1.1/xref/frameworks/base/core/java/android/text/TextUtils.java#220

Thanks for those who might shed some light on how the function is called.

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1 Answer

  1. Editorial Team
    public static boolean regionMatches (CharSequence one,
                   int toffset, CharSequence two, int ooffset, int len)

    Sample code:

    CharSequence one = "asdfQWERTYc1234";
CharSequence two = "ghjklzxcQWERTYg7890kl";
boolean match = TextUtils.regionMatches(one, 4, two, 8, 6);

    match is true.

    Explanation:

    In charsequence one, start from toffset (4) and get a number of characters equal to len (6) => QWERTY

    In charsequence two, start from ooffset (8) and get a number of characters equal to len (6) => QWERTY

    Both charsequences match, so the method returns true.

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