无涯教程-Java 正则 - static Pattern compile(String regex, int flags)函数

java.util.regex.Pattern.compile(String regex，int flags)方法将给定的正则表达式编译为一个模式。

static Pattern compile - 声明

以下是 java.util.regex.Pattern.compile(String regex，int flags)方法的声明。

public static Pattern compile(String regex, int flags)

• regex     - 要编译的表达式。

• flags      - 匹配标志，它是一个位掩码，可能包括CASE_INSENSITIVE，MULTILINE，DOTALL，UNICODE_CASE，CANON_EQ，UNIX_LINES，LITERAL，UNICODE_CHARACTER_CLASS和COMMENTS。

static Pattern compile - 异常

• IllegalArgumentException   - 如果在标志中设置了与定义的匹配标志相对应的位以外的位。

• PatternSyntaxException       - 如果表达式的语法无效。

static Pattern compile - 示例

下面的示例演示java.util.regex.Pattern.compile(String regex，int flags)方法的用法。

package com.learnfk;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PatternDemo {
private static final String REGEX = "(.)(\d+)(.)?# 3 capturing groups";
private static final String INPUT = "This is a sample Text, 1234, with numbers in between.";
public static void main(String[] args) {
//创建一个模式
Pattern pattern = Pattern.compile(REGEX,Pattern.COMMENTS);
  </span><span class="com">//获取匹配器对象</span><span class="pln">
  </span><span class="typ">Matcher</span><span class="pln"> matcher </span><span class="pun">=</span><span class="pln"> pattern</span><span class="pun">.</span><span class="pln">matcher</span><span class="pun">(</span><span class="pln">INPUT</span><span class="pun">);</span><span class="pln"> 

  </span><span class="kwd">if</span><span class="pun">(</span><span class="pln">matcher</span><span class="pun">.</span><span class="pln">find</span><span class="pun">())</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
     </span><span class="com">//获取 MatchResult 对象</span><span class="pln">
     </span><span class="typ">MatchResult</span><span class="pln"> result </span><span class="pun">=</span><span class="pln"> matcher</span><span class="pun">.</span><span class="pln">toMatchResult</span><span class="pun">();</span><span class="pln">

     </span><span class="com">//在匹配的最后一个字符之后打印偏移量。</span><span class="pln">
     </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"First Capturing Group - Match String end(): "</span><span class="pun">+</span><span class="pln">result</span><span class="pun">.</span><span class="kwd">end</span><span class="pun">());</span><span class="pln">         
  </span><span class="pun">}</span><span class="pln">

}
}

让无涯教程编译并运行以上程序，这将产生以下输出-

First Capturing Group - Match String end(): 53

参考链接

www.learnfk.com/javaregex/j…