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regex: added documentation about multiple dots syntax error (#11147)

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penguindark 2021-08-12 07:54:57 +02:00 committed by GitHub
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vlib/regex/README.md
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@ -133,17 +133,17 @@ Suppose you have `abccc ddeef` as a source string, that you want to parse
with a regex. The following table show the query strings and the result of with a regex. The following table show the query strings and the result of
parsing source string. parsing source string.
+--------------+-------------+
| query string | result | | query string | result |
|--------------|-------------| |--------------|-------------|
| `.*c` | `abc` | | `.*c` | `abc` |
| `.*dd` | `abcc dd` | | `.*dd` | `abcc dd` |
| `ab.*e` | `abccc dde` | | `ab.*e` | `abccc dde` |
| `ab.{3} .*e` | `abccc dde` | | `ab.{3} .*e` | `abccc dde` |
+--------------+-------------+
The dot matches any character, until the next token match is satisfied. The dot matches any character, until the next token match is satisfied.
**Important Note:** *Consecutive dots, for example `...`, are not allowed.*
*This will cause a syntax error. Use a quantifier instead.*
### OR token ### OR token
The token `|`, means a logic OR operation between two consecutive tokens, The token `|`, means a logic OR operation between two consecutive tokens,
@ -481,13 +481,13 @@ re.flag = regex.F_BIN
- `F_EFM`: exit on the first char matches in the query, used by the - `F_EFM`: exit on the first char matches in the query, used by the
find function. find function.
- `F_MS`: matches only if the index of the start match is 0, - `F_MS`: matches only if the index of the start match is 0,
same as `^` at the start of the query string. same as `^` at the start of the query string.
- `F_ME`: matches only if the end index of the match is the last char - `F_ME`: matches only if the end index of the match is the last char
of the input string, same as `$` end of query string. of the input string, same as `$` end of query string.
- `F_NL`: stop the matching if found a new line char `\n` or `\r` - `F_NL`: stop the matching if found a new line char `\n` or `\r`
## Functions ## Functions