vlsi commented on PR #5869:
URL: https://github.com/apache/jmeter/pull/5869#issuecomment-1537114844
TL;DR: adding new language constructs to existing languages is not easy. We
should refrain from extending existing languages.
```java
MessageFormat.format("Hello {")
```
yields
```
java.lang.IllegalArgumentException: Unmatched braces in the pattern.
at
java.base/java.text.MessageFormat.applyPattern(MessageFormat.java:521)
at java.base/java.text.MessageFormat.<init>(MessageFormat.java:371)
at java.base/java.text.MessageFormat.format(MessageFormat.java:860)
```
`MessageFormat.format("Doesn't contain quote")` yields `Doesnt contain
quote`.
So we should either declare that the format uses `MessageFormat` patterns
(with all the `'` for escapes), or we should declare we use a completely
different language with its own escapes.
If we go with `MessageFormat`, then we should assume people could use `'`
for literal parts like `Doesn''t contain quote` for expressing `Doesn't`.
That means we must not blindly replace `#{...}` as it might be inside quotes.
If we continue with `MessageFormat`, we should probably use proper quote
handling when replacing `#{url}`-like named placeholders.
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