接下来,我们可以使用Java中的Pattern和Matcher类来应用正则表达式,从而匹配字符串中的所有括号内容。 importjava.util.regex.Matcher;importjava.util.regex.Pattern;publicclassExtractParentheses{publicstaticvoidmain(String[]args){Stringtext="This is a (sample) text (with multiple) parentheses";Stringregex="\\(...
importjava.util.regex.Matcher;importjava.util.regex.Pattern;publicclassExtractNumbers{publicstaticvoidmain(String[]args){Stringinput="Hello123, this is a test456 string7 with numbers89!";StringnumbersOnly=extractNumbers(input);System.out.println("Extracted numbers: "+numbersOnly);}publicstaticStringe...
比如,下面的情况:"The the theme of this article is the Java's regex package.",这一点在regex中能非常简单地实现,即通过使用在Pattern类中预定义的静态标志CASE_INSENSITIVE : Pattern pattern =Pattern.compile("//b(//w+)//s+//1//b", Pattern.CASE_INSENSITIVE); 有关正则表达式的话题是非常丰富,...
即使你对正則表達式比較陌生,使用regex包后会很快发现它强大功能和可伸缩性。假设你是个来自Perl或其他语言王国的老练的正則表達式的黑客,使用过regex包后,你将会安心地投入到java的世界,而放弃其他的工具,并把java的regex包看成是手边必备的利器。 CharSequence JDK 1.4定义了一个新的接口,叫CharSequence。它提供了...
Expand any instances of "{key}" (where pOpen is "{" and pClose is "}") with the corresponding value from pMap. static java.lang.StringextractString(java.lang.String pStr) Return pStr if incoming value is not null, or return empty string otherwise. ...
Misuse ofsubstring()with Null or Empty Strings Handling Null Strings Stringstr=null;try{Stringresult=str.substring(0,2);}catch(NullPointerExceptione){System.out.println("Cannot extract substring from null string.");} Copy Solution:Check fornullbefore callingsubstring(). ...
import java.util.regex.Matcher; import java.util.regex.Pattern; 接下来,我们可以编写一个方法来提取文本中的URL: 代码语言:java 复制 public static List<String> extractUrls(String text) { List<String> urls = new ArrayList<>(); String urlPattern = "(?:https?|ftp)://(?:[\\w_-]+(?...
if (inputString.matches(stringRegexPattern)) { // it matched... do something with it... } This is, however, a convenience routine, and convenience always comes at a price. If the regex is going to be used more than once or twice in a program, it is more efficient to construct and...
We can use thesplitmethod from theStringclass to extract a substring. Say we want to extract the first sentence from the exampleString.This is quite easy to do usingsplit: String[] sentences = text.split("\\."); Since the split method accepts a regex we had to escape the period charac...
Using the JSON from the previous section, here are some simple API calls to extract credential information. CfEnvcfEnv=newCfEnv();StringredisHost=cfEnv.findCredentialsByTag("redis").getHost();StringredisPort=cfEnv.findCredentialsByTag("redis").getPort();StringredisPassword=cfEnv.findCredentialsByTag...