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<TITLE>Setting Case Sensitivity in a Regular Expression
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  <h3>
    e433.  
    Setting Case Sensitivity in a Regular Expression</h3>

By default, a pattern is case-sensitive.  By adding a flag, a pattern
can be made case-insensitive.  

<P> It is also possible to control case sensitivity within a
pattern using the inline modifier <code>(?i)</code>.  The inline modifier
affects all characters to the right and in the same enclosing group,
if any. For example, in the pattern <code>a(b(?i)c)d</code>, only <code>c</code>
is allowed to be case-insensitive.  You can also force case
sensitivity with <code>(?-i)</code>.

<P> The inline modifier can also contain pattern characters using
the form <code>(?i:abc)</code>.  In this case, only those pattern characters
inside the inline modifier's enclosing group are affected.  This form
does not capture text (see <a href="../java.util.regex/Group.html" class="eglink"><font size="-1"><b>e436</b> Capturing Text in a Group in a Regular Expression</font></a>).


<pre>
    CharSequence inputStr = <font color="#0066ff"><i>"Abc"</i></font>;
    String patternStr = <font color="#0066ff"><i>"abc"</i></font>;
    
    // Compile with case-insensitivity
    Pattern pattern = Pattern.compile(patternStr, Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher(inputStr);
    boolean matchFound = matcher.matches();    // true
    
    // Use an inline modifier
    matchFound = pattern.matches(<font color="#0066ff"><i>"abc"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // false
    matchFound = pattern.matches(<font color="#0066ff"><i>"(?i)abc"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // true
    matchFound = pattern.matches(<font color="#0066ff"><i>"a(?i)bc"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // true
    
    // Use enclosing form
    matchFound = pattern.matches(<font color="#0066ff"><i>"((?i)a)bc"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // false
    matchFound = pattern.matches(<font color="#0066ff"><i>"(?i:a)bc"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // false
    matchFound = pattern.matches(<font color="#0066ff"><i>"a((?i)b)c"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // true
    matchFound = pattern.matches(<font color="#0066ff"><i>"a(?i:b)c"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // true
    
    // Use a character set
    matchFound = pattern.matches(<font color="#0066ff"><i>"[a-c]+"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // false
    matchFound = pattern.matches(<font color="#0066ff"><i>"(?i)[a-c]+"</i></font>, <font color="#0066ff"><i>"aBc"</i></font>); // true
</pre>
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            &nbsp;Related Examples
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e434. <a class="eglink" href="Comment.html?l=rel">
    Adding Comments to a Regular Expression
</a>
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e435. <a class="eglink" href="MultiFlags.html?l=rel">
    Compiling a Pattern with Multiple Flags
</a>
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        See also: 
<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Groups">
    Groups
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Lines">
    Lines
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Paragraphs">
    Paragraphs
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Searching%20and%20Replacing">
    Searching and Replacing
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/java.util.regex/pkg.html?l=rel#Tokenizing">
    Tokenizing
</a>&nbsp;&nbsp;

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