字符串不匹配,即使"patternString"是"text"的子字符串

Question

我正在尝试学习Java正则表达式,并尝试将较小的字符串与另一个字符串进行匹配.以下是我提出的代码.

String text = "this is the text to be searched for occurrences of the http://www.nba.com.";
    String patternString = "http://.*";
    Pattern p1 = Pattern.compile(patternString);
    Matcher m1 = p1.matcher(text);
    boolean doesItMatch = m1.matches();
    System.out.println(doesItMatch);
    System.out.println(m1.group());

我期待着doesItMatch平等true和m1.group()平等http://nba.com..但是,IDE改为输出

false
Exception in thread "main" java.lang.IllegalStateException: No match found
    at java.util.regex.Matcher.group(Matcher.java:536)
    at java.util.regex.Matcher.group(Matcher.java:496)
    at JTORegex.RegularExpression.main(RegularExpression.java:23)
Java Result: 1

为什么字符串与字符串patternString不匹配text？patternString确实存在于text.为什么会这样？

Answer 1

matches匹配完整的String.使用find部分匹配

boolean hasAMatch = m1.find();