For example I want to check that my when I split my string that the first part only contains numbers and decimal points.
I have done the following
String[] s1 = {"0.12.13.14-00000001-00000", "0.12.13.14-00000002-00000"};
String[] parts_s1 = s1.split("-");
System.out.println(parts_s1[0]);
if(parts_s1[0].matches("[0-9]")
But thats only checking for numbers and not decimals. How can I also check for decimals in this? For example I want to check for 0.12.13.14 that it works and something like 0.12.13.14x will not work.
Add the dot character in the regex as follows:
if(parts_s1[0].matches("[0-9.]*")) { // match a string containing digits or dots
The *
is to allow multiple digits/decimal points.
In case at least one digit/decimal point is required, replace *
with +
for one or more occurrences.
EDIT:
In case the regex needs to match (positive) decimal numbers (not just arbitrary sequences of digits and decimal points), a better pattern would be:
if(parts_s1[0].matches("\\d*\\.?\\d+")) { // match a decimal number
Note that \\\\d
is equivalent to [0-9]
.
You can simply add a dot to the list of allowed characters:
if(parts_s1[0].matches("[.0-9]+")
This, however, would match strings that are composed entirely of dots, or have sequences of multiple dots.
You can use this regex:
\\d+(\\.\\d+)*
Code:
if(parts_s1[0].matches("\\d+(\\.\\d+)*") {...}
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