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

Question

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("\\-", " - ");

Contrary to popular belief, slash and backslash are not the same character. :) — hobbs
– hobbs, Commented Mar 19, 2011 at 18:02
was an error when posting to stackoverflow used correct slashes in the program. — Ryan Leach
– Ryan Leach, Commented Mar 19, 2011 at 18:05

JRL · Accepted Answer · 2011-03-19 18:04:12Z

3

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 = ...

answered Mar 19, 2011 at 18:04

JRL

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1 Comment

Ryan Leach Over a year ago

turned out it was a combination. str = str.replaceAll("\\+"," + "); str = str.replaceAll("\\-", " - ");

Stan Kurilin · Accepted Answer · 2011-03-19 18:01:22Z

2

Just use

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

answered Mar 19, 2011 at 18:01

Stan Kurilin

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Comments

Ryan Leach · Accepted Answer · 2011-03-19 18:12:52Z

-1

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

answered Mar 19, 2011 at 18:12

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