It is necessary to split the string into two parts in java

Question

I have a string that contains an adjacent piece of numbers, and then a continuous piece of characters. I need to break them into two parts (one integer part and one line).

I tried using String.split("\\D", 1) , but it eats the first character. I checked the entire String API and did not find a suitable method.

Is there any way to do this?

Answer 1

Use the return paths: str.split("(?<=\\d)(?=\\D)")

 String[] parts = "123XYZ".split("(?<=\\d)(?=\\D)"); System.out.println(parts[0] + "-" + parts[1]); // prints "123-XYZ" 

\d - character class for digits; \d is its negation. Thus, this zero-correspondence statement coincides with the position in which the preceding character is a digit (?<=\d) and the next character is not a digit (?=\D) .

References

• regular-expressions.info/Lookarounds and Character Class

Related Questions

• The separation of Java is the use of my characters.
• Is there a way to split strings with String.split () and enable separators?

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Alternative solution using limited separation

The following also works:

  String[] parts = "123XYZ".split("(?=\\D)", 2); System.out.println(parts[0] + "-" + parts[1]); 

It breaks just before we see a number. This is much closer to your original solution, except that since it does not actually correspond to an asymmetric symbol, it does not “eat it up”. In addition, it uses the limit of 2 , which you really need.

API Links

• String.split(String regex, int limit)
  • If the limit n greater than zero, the pattern will be applied no more than n - 1 times, the length of the array will be no more than n , and the last record of the array will contain all the input data for the last Corresponding separator.

Answer 2

There is always an old-fashioned way:

 private String[] split(String in) { int indexOfFirstChar = 0; for (char c : in.toCharArray()) { if (Character.isDigit(c)) { indexOfFirstChar++; } else { break; } } return new String[]{in.substring(0,indexOfFirstChar), in.substring(indexOfFirstChar)}; } 

(I hope that it works only with a number or char - only strings) - cannot check it here, if not, consider it a general idea)