The shell tr
command support replace one set of characters with another set.
For example, echo hello | tr [a-z] [A-Z]
will tranlate hello
to HELLO
.
In java, however, I must replace each character individually like the following
"10 Dogs Are Racing"
.replaceAll ("0", "0")
.replaceAll ("1", "1")
.replaceAll ("2", "2")
// ...
.replaceAll ("9", "9")
.replaceAll ("A", "A")
// ...
;
The apache-commons-lang library provides a convenient replaceChars
method to do such replacement.
// half-width to full-width
System.out.println
(
org.apache.commons.lang.StringUtils.replaceChars
(
"10 Dogs Are Racing",
"0123456789ABCDEFEGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
"0123456789ABCDEFEGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
)
);
// Result:
// 10 Dogs Are Racing
But as you can see, sometime the searchChars/replaceChars are too long (also too boring, please find a duplicated character in it if you want), and can be expressed by a simple regular expression [0-9A-Za-z]
/[0-9A-Za-z]
. Is there a regular expression way to achieve that ?
See Question&Answers more detail:
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