replaceAll doesn't affect the string [duplicate]

Question

I trying to use regex within the replaceAll function. I need to do a real simple task which is to switch ever = and ~ operator with a : char with no spaces!

For instance:

(srcIP = 0.0.0.0) AND (dstIP~0.0.0.0 OR protocol  =     TCP)

turns to

(srcIP:0.0.0.0) AND (dstIP:0.0.0.0 OR protocol:TCP)

I am trying to use the following code

query.replaceAll("[ ]*(=|~)[ ]*", ":");

but it doesn't work. Is there any way to do this using replaceAll function? It seems that it doesn't work with regex.

replaceAll and replace don't change the String, they create a new one. — QBrute
– QBrute, Commented Aug 21, 2016 at 8:48

Maroun · Accepted Answer · 2016-08-21 07:42:50Z

2

Your regex is fine (although it can be improved). Proof:

System.out.println("(srcIP = 0.0.0.0) AND (dstIP~0.0.0.0 OR protocol = TCP)".replaceAll("[ ]*(=|~)[ ]*", ":"));

Prints:

(srcIP:0.0.0.0) AND (dstIP:0.0.0.0 OR protocol:TCP)

Strings are immutable in Java, replaceAll doesn't modify the string in-place, it returns a new one. You're probably not assigning the result back.

Your regex can be rewritten as:

\\s*[=~]\\s*

answered Aug 21, 2016 at 7:42

Maroun

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1 Comment

RefiPeretz Over a year ago

You are absolutely right I forgot it is immutable thanks.

Guenther · Accepted Answer · 2016-08-21 07:42:39Z

0

This

System.out.println("(srcIP = 0.0.0.0) AND (dstIP~0.0.0.0 OR protocol = TCP)".replaceAll("[ ]*(=|~)[ ]*", ":"));

works fine for me

answered Aug 21, 2016 at 7:42

Guenther

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