CODEWITHSUNDEEP
javaregex
Ryan Leach
Ryan Leach

Reputation: 4470

in java using regular expressions replace + and - with " + " and " - "

in java im trying to use string.replaceall to replace "+" and "-" with " + " and " - "

However str.replaceall("+"," + ") results in an error,
so I tried str.replaceall("\+"," + ") and str.replaceall("\Q+\E"," + ")

neither worked

after that i tried str.replaceall("\+"," + ") but forgot to mention it originally, but it does not affect my strings which contain "1x^5+2x^4+6x^3+3x^2+4x^0"

Final answer =
str = str.replaceAll("\\+"," + ");
str = str.replaceAll("\\-", " - ");

Upvotes: 0

Views: 150

Answers (3)

Ryan Leach
Ryan Leach

Reputation: 4470

Final answer =
str = str.replaceAll("\\+"," + ");
str = str.replaceAll("\\-", " - ");

Upvotes: -1

JRL
JRL

Reputation: 77995

No need for a regex, just use str = str.replace("+", " + ").replace("-", " - ");

Note that since strings are immutable, you need to use the returned string, hence the str = ...

Upvotes: 3

Stan Kurilin
Stan Kurilin

Reputation: 15792

Just use 

str.replaceall("\\+"," + ")

Upvotes: 2

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