Regex Reference

Reference for regular expressions used in StackQL.

Supported syntax

The following regular expression syntax is supported in StackQL:

Expression	Description
`X*`	zero or more occurrences of `X`
`X+`	one or more occurrences of `X`
`X?`	zero or one occurrences of `X`
`(X)`	match `X`
`X`\|`Y`	`X` or `Y`
`^X`	`X` occurring at the beginning of the string
`X$`	`X` occurring at the end of the string
`.`	Match any single character
`\c`	Character `c` where `c` is one of `\{}()[]`\|`*+?.`
`\c`	C-language escapes for `c` in `afnrtv`. ex: `\t` or `\n`
`[abc]`	Any single character from the set `abc`
`[^abc]`	Any single character not in the set `abc`
`[a-z]`	Any single character in the range `a-z`
`[^a-z]`	Any single character not in the range `a-z`