Getting " when trying to replace a character in string [duplicate]

Question

I want to replace " from a string with ^.

String str = "hello \"there"; System.out.println(str); String str1 = str.replaceAll("\"", "^"); System.out.println(str1); String str2= str1.replaceAll("^", "\""); System.out.println(str2);

and the output is :

hello "there hello ^there "hello ^there

why I am getting extra " in start of string and ^ in between string

I am expecting:

hello "there

hoan · Accepted Answer · 2018-03-27 15:17:56Z

9

the replaceAll() method consume a regex for the 1st argument.

the ^ in String str2= str1.replaceAll("^", "\""); will match the starting position within the string. So if you want the ^ char, write \^

Hope this code can help:

String str2= str1.replaceAll("\\^", "\"");

edited Mar 27, 2018 at 15:17

answered Mar 27, 2018 at 13:13

hoan

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6 Comments

Kumar Harsh Over a year ago

Then how can i print the output i want

Maurice Perry Over a year ago

Yes: use replace instead of replaceAll

xxxvodnikxxx Over a year ago

@MauricePerry String str2= str1.replaceAll("\\^", "\""); should works you will "escape" ^ but `` need to be also escaped :D

Maurice Perry Over a year ago

@xxxvodnikxxx so would String str2 = str1.replace("^", "\""); and it's simpler

xxxvodnikxxx Over a year ago

For this case will work also replace instead replace all, but ofc if you will want really to replace all in string, I mean if there will be more occurrence, then you can use it.. As obviously method name says.

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Reimeus · Accepted Answer · 2018-03-27 14:01:00Z

4

Try using replace which doesnt use regex

String str2 = str1.replace("^", "\"");

edited Mar 27, 2018 at 14:01

answered Mar 27, 2018 at 13:15

Reimeus

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1 Comment

Jacek Cz Over a year ago

or, similar char based replace('^','"') Both have better performance than regex versions

xingbin · Accepted Answer · 2018-03-27 13:15:14Z

^ means start of a line in regex, you can add two \ before it:

 String str2= str1.replaceAll("\\^", "\"");

The first is used to escape for compiling, the second is used to escape for regex.

Hulk · Accepted Answer · 2018-03-27 15:36:40Z

Since String::replaceAll consumes regular expression you need to convert your search and replacement strings into regular expressions first:

str.replaceAll(Pattern.quote("\""), Matcher.quoteReplacement("^"));

Rmahajan · Accepted Answer · 2018-03-27 13:32:41Z

Why do you want to use replaceAll. Is there any specific reason ? If you can use replace function then try below String str2= str1.replace("^", "\"");

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