importjava.util.regex.Matcher;importjava.util.regex.Pattern;publicclassRegexEscapeParentheses{publicstaticvoidmain(String[]args){Stringinput="计算结果是:5 + (3 * 2)";// 转义小括号,构建正则表达式Stringregex="\\(.*?\\)";// 匹配小括号内的任意内容Patternpattern=Pattern.compile(regex);Matchermatch...
publicclassMain{publicstaticvoidmain(String[]args){StringtestString="This is a test (sample) string.";// 调用转义函数StringescapedString=RegexEscape.escapeParentheses(testString);// 输出转义后的结果System.out.println("Original String: "+testString);System.out.println("Escaped String: "+escapedStri...
Capturing groups are numbered by counting their opening parentheses from the left to the right. In the expression ((A)(B(C))), for example, there are four such groups −((A)(B(C))) (A) (B(C)) (C)To find out how many groups are present in the expression, call the groupCount...
We've mentioned already that if you enclose a group of characters in parentheses, you can apply quantifiers or logical or to the whole group. What is even more awesome is that you can refer to the actual characters in the text matched by the group, later. Here's how you do it: Java...
s = mInput.group(1); // Captured by parentheses // Replace two or more spaces with a single space: s = s.replaceAll(" {2,}", " "); // Replace one or more spaces at the beginning of each // line with no spaces. Must enable MULTILINE mode: ...
Capturing groups are numbered by counting their opening parentheses from left to right. In the expression((A)(B(C))), for example, there are four such groups: 1((A)(B(C))) 2(A) 3(B(C)) 4(C) Group zero always stands for the entire expression. ...
A group is a captured subsequence of characters which may be used later in the expression with a backreference. We've mentioned already that if you enclose a group of characters in parentheses, you can apply quantifiers or logical or to the whole group. What is even more awesome is that yo...
Which indeed will throw an exception since the regex sngine expects a closing parentheses. You will need to escape the '('. But whenever you put a single backslash inside a String literal, the compiler expects a character like 'n' (new line) , 't' (tab), a '"' (double quote), etc...
Capturing groups are numbered by counting their opening parentheses from left to right. In the expression ((A)(B(C))), for example, there are four such groups: Group zero always stands for the entire expression. Capturing groups are so named because, during a match, each subsequence of...
Capturing groups are numbered by counting their opening parentheses from left to right. In the expression ((A)(B(C))), for example, there are four such groups: 1 ((A)(B(C))) 2 (A) 3 (B(C)) 4 (C) Group zero always stands for the entire expression. Capturing groups are so na...