JAVA - How to replace all \ characters to \\ in String [duplicate]

Question

I am trying to replace all \ characters to \\ by java. This may be silly question, but I have tried many things for it. My piece of attempt is below :

String strToReplace = oldString;

strToReplace = strToReplace.replaceAll("\\","\\\\");

The oldString contains "D:\Work\Project\Data". That I read from a property file. Above is giving me error :

Exception in thread "main" java.util.regex.PatternSyntaxException: Unexpected internal error near index 1
\
 ^
    at java.util.regex.Pattern.error(Pattern.java:1955)
    at java.util.regex.Pattern.compile(Pattern.java:1702)
    at java.util.regex.Pattern.<init>(Pattern.java:1351)

Any other approach to do this?

Perhaps you need to define strToReplace as "D:\\Work\\Project\\Data"; — dave
– dave, Commented Jan 30, 2019 at 10:08
I edited the question. The string contains value that I read from a property file. — Arnab Dhar
– Arnab Dhar, Commented Jan 30, 2019 at 10:15

student18 · Accepted Answer · 2019-01-30 10:10:19Z

2

replaceAll interprets your argument as a RegEx. You need to double escape it.

try following:

string.replaceAll("\\\\", "\\\\\\\\");

See following link

answered Jan 30, 2019 at 10:10

student18

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