How to disallow these characters € [ \ ] ^ { | } ~ in a java string

Question

I need to check if a JAVA string which we send to commzgate(3rd party) as SMS but our SMS fails because our string is containing some invalid/non-readable characters which I need to check first. Basically i need to put a regular expression check in java to validate if my string contains following characters or not :-

€ [ \ ] ^ { | } ~

Any suggestions! Moreover when I try to put these characters in my java file, it does not save and alerts for non-utf8 character message in eclipse, so everytime i have to remove € and save. Is that so my validation is not complete. Thanks

[`Java` != `JavaScript`](http://stackoverflow.com/a/245069/1393766), read tags description before you use them. — Pshemo, Nov 20 '14 at 16:02
A safer thing yet would be to check if the char is valid rather than invalid. In other words check that it is alphabetical or a number or one of the 30 or so symbols you wish to allow — Michael Goldstein, Nov 20 '14 at 16:09

score 1 · Accepted Answer · edited May 23 '17 at 11:53

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You appear to have included an answer in your question - you can use a regular expression to check for these characters and replace/remove them as required. As you are hitting a problem with Eclipse on a non-UTF-8 character (the Euro symbol) you could instead use the unicode character U+20AC (which should be it).

regular expression java

edited May 23 '17 at 11:53

Community

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answered Nov 20 '14 at 16:04

Ross Taylor-Turner

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score 0 · Answer 2 · answered Nov 20 '14 at 16:06

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The regexp is /[€\[\]\{\}\~]/g You can do simpler but this one works

For example in js

var a = "€[]{}^|~"
var reg = /[€\[\]\{\}\~|^]/g
a.replace(reg, "") //output ""

answered Nov 20 '14 at 16:06

Waxo

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OP probably didn't mean javascript, you may want to update your answer. – brandonscript Nov 20 '14 at 17:23

score 0 · Answer 3 · answered Nov 20 '14 at 17:25

Use simply:

^[^€\\[\\]\\^{|}~\\\]*$
// €  [  ]  ^{|}~  \    < literals

Which matches the start and end of string, any characters (or none) provided they aren't in the (escaped) character class. The ^ inside the character class here indicates that it should not match.

Note the double-escaped characters because Java requires literal characters to be escaped as well.

How to disallow these characters € [ \ ] ^ { | } ~ in a java string

3 Answers3