Check if String has '+' character

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I need to search in a string if it has the + character, like this:

teste = teste.replaceAll("+", "e");

but I return this error:

java.util.regex.Patternssyntaxexception: Dangling meta Character '+'

java string replace
  • 2

    Tries to escape the character by placing a backslash in front: \+

  • It didn’t work with + but with + thanks!!

  • 1

    @Felipekrause , in the case of Java, the escape character needs to be escaped to take effect on replace. Hence the two bars. The "compiled" result of your string (say so) is \+, as @Andersoncarloswoss said

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1 answer

5

The character + is reserved in regular expressions, so it is necessary to escape it, however in the Java the character \ is used to escape expressions within the String, then there is the need to use it twice to ensure literal use. Substituting in your expression would look like this:

teste = teste.replaceAll("\\+", "e");

The + after a string means "one or more occurrences", for example: [0-9]+ meaning "one or more occurrences of a number (from zero to nine).

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