String replace a Backslash

Question

How can I do a string replace of a back slash   Input Source String   sSource    http   www example com  value     In the above String I want to replace      with a       Expected ouput after replace   sSource    http   www example com value     I get the Source String from a third party  therefore I have control over the format of the String   This is what I have tried  Trial 1   sSource replaceAll               Exception Unexpected internal error near index 1    Trial 2    sSource replaceAll                No Exception  but does not do the required replace  Does not do anything   Trial 3    sVideoURL replace                No Exception  but does not do the required replace  Does not do anything

User · Answer

s replaceAll                 You need to mask a backslash in your source  and for regex  you need to mask it again  so for every backslash you need two  which ends in 4    But   s    http   www example com   value     needs two backslashes in source as well

User · Answer

sSource   sSource replace                 String is immutable - each method you invoke on it does not change its state  It returns a new instance holding the new state instead  So you have to assign the new value to a variable  it can be the same variable  replaceAll     uses regex  You don t need that

User · Answer

To Replace backslash at particular location   if   stringValue contains        amp  amp  stringValue indexOf       location-1    location-1          stringValue stringValue substring 0 location-1

User · Answer

This will replace backslashes with forward slashes in the string   source   source replace

User · Answer

Try     sSource   sSource replaceAll                Edit   Ok even in stackoverflow there is backslash escape    You need to have four backslashes in your replaceAll first String argument     The reason of this is because backslash is considered as an escape character for special characters  like  n for instance   Moreover replaceAll first arg is a regular expression that also use backslash as escape sequence  So for the regular expression you need to pass 2 backslash  To pass those two backslashes by a java String to the replaceAll  you also need to escape both backslashes  That drives you to have four backslashes for your expression  That s the beauty of regex in java

User · Answer

sSource   StringUtils replace sSource

User · Answer

you have to do  sSource replaceAll                  because the backshlash should be escaped twice one for string in source one in regular expression

User · Answer

Try replaceAll             or replaceAll                 The problem here is that a backslash is  1  an escape chararacter in Java string literals  and  2  an escape character in regular expressions     each of this uses need doubling the character  in effect needing 4   in row   Of course  as Bozho said  you need to do something with the result  assign it to some variable  and not throw it away  And in this case the non-regex variant is better

[java] String replace a Backslash

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