Java regex not replacing my pattern

Question

Code:

record = record.replace("%icmp4-echo.*%","%\"icmp4-echo.*\"%");

record originally is:

%icmp4-echobalabalabalabala%

want to get replaced to:

%"icmp4-echobalabalabalabala"%

But my code does not work. Need some help or hint. thanks!

@Pshemo From what I heard here on SO, String#replace() actually uses replaceAll() as part of its implementation. But not in the case of the OP. — Tim Biegeleisen
– Tim Biegeleisen, Commented Mar 14, 2017 at 6:17

Tim Biegeleisen · Accepted Answer · 2017-03-14 06:09:25Z

7

Use String#replaceAll():

String input = "%icmp4-echobalabalabalabala%";
input = input.replaceAll("%(icmp4-echo.*?)%", "%\"$1\"%");

Here, we match the pattern %(.*?)% and then replace that with %"$1"%. The quantity $1 is a capture group, equal to whatever is inside the parenthesis. As a side note, I made the capture group (.*?) non greedy, in case you want to replace multiple occurrences inside your string.

answered Mar 14, 2017 at 6:09

Tim Biegeleisen

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