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Home » Eclipse Projects » Advanced Scripting Environment (EASE) » Regexp in String.replaceAll() not working?
Regexp in String.replaceAll() not working? [message #1844804] Sun, 26 September 2021 09:48 Go to next message
Maurizio M Gavioli is currently offline Maurizio M GavioliFriend
Messages: 2
Registered: September 2021
Junior Member
Hi,
I'm probably overlooking something very trivial but I seem unable to use regexp in search and replace in JS (Rhino) EASE scripts.

No regexp whatsoever seems to ever match, even regexps which work as intended with String.search() and/or very simple (and largely useless) regexps like /abc/g.

I have tried regexps directly in the statement:
txt = txt.replaceAll(/abc/g, 'cba');

defined previously as a literal:
var re = /abc/g;
txt = txt.replaceAll(re, 'cba');

or with the constructor:
var re = new RegExp('abc', 'g');
txt = txt.replaceAll(re, 'cba');

None of these does anything: txt is never altered. I have also tried without the global flag with no difference. This happens both within scripts and in the immediate interpreter. If the same regexp is used with String.search(re) it works as expected.

On the other hand, using String.replace() with a regular expression I get the following error:
org.eclipse.ease.ScriptExecutionException: SyntaxError: The choice of Java method java.lang.String.replace matching JavaScript argument types (function,string) is ambiguous; candidate methods are: 
    class java.lang.String replace(java.lang.CharSequence,java.lang.CharSequence)
    class java.lang.String replace(char,char)


What am I doing wrong?
Re: Regexp in String.replaceAll() not working? [message #1845020 is a reply to message #1844804] Sun, 03 October 2021 09:59 Go to previous messageGo to next message
Christian Pontesegger is currently offline Christian PonteseggerFriend
Messages: 232
Registered: July 2009
Location: Graz, Austria
Senior Member
You are trying to use a javascript regex as parameter for a Java method. you probably wanna use [1]

HTH
Christian

[1] https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html#replaceAll(java.lang.String,java.lang.String)
Re: Regexp in String.replaceAll() not working? [message #1846994 is a reply to message #1845020] Mon, 11 October 2021 15:55 Go to previous messageGo to next message
Maurizio M Gavioli is currently offline Maurizio M GavioliFriend
Messages: 2
Registered: September 2021
Junior Member
Thanks for your reply; in fact it helps a lot: by using Java regex things do work.

I am confused, though: the statement is inside a Javascript script, run by the Rhino Javascript engine and the string is obtained through a Javascript DOM-accessing method; what can tell me. in this as well in similar contexts, that this string is not a Javascript object, but rather a Java object with Java method?

Many thanks, mmg

Christian Pontesegger wrote on Sun, 03 October 2021 09:59
You are trying to use a javascript regex as parameter for a Java method. you probably wanna use [1]

HTH
Christian

[1] https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html#replaceAll(java.lang.String,java.lang.String)

Re: Regexp in String.replaceAll() not working? [message #1847010 is a reply to message #1846994] Tue, 12 October 2021 06:38 Go to previous message
Christian Pontesegger is currently offline Christian PonteseggerFriend
Messages: 232
Registered: July 2009
Location: Graz, Austria
Senior Member
Hi,

in Rhino you may have as well JavaScript Strings as Java Strings. What type you get depends on the source that creates the string. These 2 String types are a permanent source of confusion and failing scripts. Therefore I recommend to convert Strings to dedicated objects:
var anyString = ....;
var javaScriptString = anyString + "";
var javaString = new java.lang.String(anyString);


HTH
Christian
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