CODEWITHSUNDEEP
javaregexstringcompare
TaZlyy
TaZlyy

Reputation: 13

Check if a String is in a specific form JAVA

Lets say I have a string 

String line = "Let x0 be {1,2,3,4}"

How can I check if it the String is written in "Let ??? be ???"

I was trying with the code below but I thing you need to know the length of the ??? to make it work

 matches = line.matches("Let \\d be \\d")

Thank you

Upvotes: 1

Views: 314

Answers (2)

Shen Yudong
Shen Yudong

Reputation: 1230

\d only match digit, short for [0-9], it can't match x0, neither any char of "{,}" so you can match with \S, which means a non-whitespace character. and since you do not know the length, and expect at least one, can add "+" to \S, like \S+. so this one can match your expect: Let \S+ be .*

Upvotes: 2

Yu Jiaao
Yu Jiaao

Reputation: 4714

try this regex "Let (\w+) be (\S+)"

String line = "Let x0 be {1,2,3,4}";
Pattern p = Pattern.compile("Let (\w+) be (\S+)");
Matcher m = p.matcher(line);
int lastMatchPos = 0;
while (m.find()) {
   System.out.println(m.group(1));
   System.out.println(m.group(2));
   if(m.group(2).length> m.group(1).length){
        //do something you want
   }
}

Upvotes: 1

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