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b7e3a1e14b
* delete asciidoc files
* add migrated files
* fix errors
* Disable docs tests
* Clarify release notes page titles
* Revert "Clarify release notes page titles"
This reverts commit 8be688648d.
* Comment out edternal URI images
* Clean up query languages landing pages, link to conceptual docs
* Add .md to url
* Fixes inference processor nesting.
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Co-authored-by: Liam Thompson <32779855+leemthompo@users.noreply.github.com>
Co-authored-by: Liam Thompson <leemthompo@gmail.com>
Co-authored-by: Martijn Laarman <Mpdreamz@gmail.com>
Co-authored-by: István Zoltán Szabó <szabosteve@gmail.com>
1.3 KiB
1.3 KiB
Regexes [painless-regexes]
Regular expression constants are directly supported. To ensure fast performance, this is the only mechanism for creating patterns. Regular expressions are always constants and compiled efficiently a single time.
Pattern p = /[aeiou]/
::::{warning} A poorly written regular expression can significantly slow performance. If possible, avoid using regular expressions, particularly in frequently run scripts. ::::
Pattern flags [pattern-flags]
You can define flags on patterns in Painless by adding characters after the trailing / like /foo/i or /foo \w #comment/iUx. Painless exposes all of the flags from Java’s Pattern class using these characters:
| Character | Java Constant | Example |
|---|---|---|
c |
CANON_EQ | 'å' ==~ /å/c (open in hex editor to see) |
i |
CASE_INSENSITIVE | 'A' ==~ /a/i |
l |
LITERAL | '[a]' ==~ /[a]/l |
m |
MULTILINE | 'a\nb\nc' =~ /^b$/m |
s |
DOTALL (aka single line) | 'a\nb\nc' =~ /.b./s |
U |
UNICODE_CHARACTER_CLASS | 'Ɛ' ==~ /\\w/U |
u |
UNICODE_CASE | 'Ɛ' ==~ /ɛ/iu |
x |
COMMENTS (aka extended) | 'a' ==~ /a #comment/x |