This article lays out POSIX Extended Regular Expression syntax implemented by ThousandEyes for page content verification in HTTP Server tests. For those wanting a more comprehensive article on this regular expression syntax, along with testing and troubleshooting guidelines, please see this article.
Single-character expressions
| . | matches any character |
| [x-y] | matches any character found in the range of x-y |
| [abcdefg] | matches any character found in the bracketed list |
| \d | matches any digit character (0-9) |
| \w | matches any alphanumeric character, including underscore |
| \s | matches any whitespace character |
| \n | matches a newline character |
| x|y | matches x OR y |
| \ | escape character |
| \W | non-alphanumeric character |
| \D | non-digit character |
| \S | non-whitespace character |
| [^abcdefg] | matches any character NOT found in the bracketed list |
Repeaters
| {n} | previous expression matches exactly n times |
| {n,} | previous expression matches at least n times |
| {,m} | previous expression matches at most m times |
| {n,m} | previous expression matches between n and m times (inclusive) |
| * | previous expression matches 0 or more times |
| ? | previous expression matches 0 or 1 times |
| + | previous expression matches 1 or more times |
Patterns
| ( | start of pattern |
| ) | end of pattern |
Boundaries
| ^ | beginning of line (only valid when used at the beginning of a pattern) |
| $ | end of line (only valid when used at the end of a pattern) |
| \` | beginning of input (start of the page) |
| \' | end of input (end of the page) |
| \b | word boundary |