This section describes the regular expression syntax that can be used in the Find dialog box.
| Pattern | Description |
| . | Any one character except newline character. |
| [abc] | a, b or c. |
| [a-z] | Any character a to z inclusive. |
| [^ac] | Any character except a and c. |
| (x) | x, where x might be any regular expression. |
| x* | Zero or more occurrences of x, where x may be any regular expression. |
| x+ | One or more occurrences of x, where x may be any regular expression. |
| x{n,m} | Between n and m occurrences of x, where x may be any regular expression. |
| x{n} | n occurrences of x, where x may be any regular expression. |
| x{n,} | n or more occurrences of x, where x may be any regular expression. |
| x|y | x or y, where x and y may be any regular expression. |
| xy | xy, where x and y may be any regular expression. |
| ^ | Beginning of a line. |
| \A | Beginning of a line. |
| $ | End of a line. |
| \z | End of a line. |
| \Z | End of a line. |
| \< | Beginning of a word. |
| \b | Beginning of a word. |
| \> | End of a word. |
| \B | End of a word. |
| Class | Description |
| \w | word |
| \W | Not word |
| \s | whitespace |
| \S | Not whitespace |
| \d | Digit |
| \D | Not digit |
| Class | Description |
| [:alnum:] | Alphanumeric. same to the [a-zA-Z0-9]. |
| [:alpha:] | Alphabetic. same to the [a-zA-Z]. |
| [:blank:] | Spaces or tabs. |
| [:cntrl:] | Any control characters. |
| [:digit:] | Numeric digits. same to the [0-9]. |
| [:graph:] | Any visible characters. (no whitespace) |
| [:lower:] | Lower-case alphabetic. same to the [a-z]. |
| [:print:] | Non-control characters. |
| [:punct:] | Punctuation characters. |
| [:space:] | Whitespace. |
| [:upper:] | Upper-case alphabetic. same to the [A-Z]. |
| [:xdigit:] | Hex digits. same to the [0-9a-fA-F]. |
| Expression | Description |
| [0-9]+ | One or more numeric characters. |
| (foo)|(bar) | Either "foo" or "bar". |
| \.html$ | Any string ending in ".html". |
| ^\. | Any string starting with a period. |
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