The substitution of slashes and backslashes in Java,javascript

Java:

In different systems, the path delimiter is different, so we need to make a judgment, and switch the delimiter;

The ReplaceAll method in the string class is as follows:

String.replaceall (String regex,string replacement), the ReplaceAll () method uses 4 backslashes to denote a backslash;

1. Java replaces the backslash (\) in the string with a double slash (\ \)

ReplaceAll is used in the regular expression, so the string escaped once, is escaped once, so a diagonal carry to write 4, such as: ReplaceAll ("\\\\", "\\\\\\\\");

2.java Replace the backslash (\) in the string with a slash (/)

ReplaceAll ("\\\\ ", "/");

3.java Replace the slash (/) in the string with a backslash (\)

ReplaceAll ("/", "\\\\");

For example str1= "AA\BBB"; str2= "AA ' BBB" to replace str1= "AA\\BBB", str2= "Aa\ ' BBB";
This must be replaced:
STR1 = Str1.replaceall ("\\\\", "\\\\\\\\");
STR2 = Str2.replaceall ("'", "\\\\ '");
The reasons are as follows:
The ReplaceAll () method of String is actually used to match the regular expression rules, \\\\,java resolves to \ \ to the regular expression, the regular expression goes through a conversion, the \ \ is converted to \; that is, Java has to use regular to represent a \. Must be written in 4 \; If you want to represent \ \, then write 8 \; So if written as: str1 = Str1.replaceall ("\ \", "\\\\"), the regular expression error will be reported.

javascript:

stringObj.replace (Rgexp, ReplaceText)   where stringobj is a string reexp Span style= "line-height:20.7999992370605px" > (REGEXP) can also be a string replacetext is an alternative to the found string.

1. JavaScript replaces the backslash (\) in a string with a double slash (\ \)

Replace (/\\/g, "\\\\");

2.JavaScript replaces the backslash (\) in the string with a slash (/)

Replace (/\\/g, "\");

3.JavaScript replaces a slash (/) in a string with a backslash (\)

Replace (/\//g, "\ \");

The substitution of slashes and backslashes in Java,javascript