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Parameters
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pattern
The text of the regular expression.
flags
If specified, flags can have any combination of the following values:
g — global match
i — ignore case
m — Treat beginning and end characters (^ and $) as working over multiple lines (i.e., match the beginning or end of each line (delimited by \n or \r), not only the very beginning or end of the whole input string)
y — sticky; matches only from the index indicated by the lastIndex property of this regular expression in the target string (and does not attempt to match from any later indexes). This allows the match-only-at-start capabilities of the character "^" to effectively be used at any location in a string by changing the value of the lastIndex property.
| var re = new RegExp("\\w+");var re = /\w+/; | /ab+c/i;new RegExp("ab+c", "i"); |
| Character | Meaning |
| * | Matches the preceding item 0 or more times. For example, /bo*/ matches 'boooo' in "A ghost booooed" and 'b' in "A bird warbled", but nothing in "A goat grunted". |
| + | Matches the preceding item 1 or more times. Equivalent to {1,}. For example, /a+/ matches the 'a' in "candy" and all the a's in "caaaaaaandy". |
| ? | Matches the preceding item 0 or 1 time. For example, /e?le?/ matches the 'el' in "angel" and the 'le' in "angle." If used immediately after any of the quantifiers *, +,?, or {}, makes the quantifier non-greedy (matching the minimum number of times), as opposed to the default, which is greedy (matching the maximum number of times). Also used in lookahead assertions, described under (?=), (?!), and (?:) in this table. |
| . | (The decimal point) matches any single character except the newline characters: \n \r \u2028 or \u2029. ([\s\S] can be used to match any character including newlines.) For example, /.n/ matches 'an' and 'on' in "nay, an apple is on the tree", but not 'nay'. |
| x | y | Matches either x or y. For example, /green|red/ matches 'green' in "green apple" and 'red' in "red apple." |
| { n, m } | Where n and m are positive integers. Matches at least n and at most m occurrences of the preceding item. For example, /a{1,3}/ matches nothing in "cndy", the 'a' in "candy," the first two a's in "caandy," and the first three a's in "caaaaaaandy". Notice that when matching "caaaaaaandy", the match is "aaa", even though the original string had more a's in it. |
| [xyz] | A character set. Matches any one of the enclosed characters. You can specify a range of characters by using a hyphen. For example, [abcd] is the same as [a-d]. They match the 'b' in "brisket" and the 'c' in "ache". |
| [^xyz] | A negated or complemented character set. That is, it matches anything that is not enclosed in the brackets. You can specify a range of characters by using a hyphen. For example, [^abc] is the same as [^a-c]. They initially match 'r' in "brisket" and 'h' in "chop." |
| [\b] | Matches a backspace. (Not to be confused with \b.) |
| \b | Matches a word boundary, such as a space. (Not to be confused with [\b].) For example, /\bn\w/ matches the 'no' in "noonday"; /\wy\b/ matches the 'ly' in "possibly yesterday." |
| Method | Description |
| exec | A RegExp method that executes a search for a match in a string. It returns an array of information. |
| test | A RegExp method that tests for a match in a string. It returns true or false. |
| match | A String method that executes a search for a match in a string. It returns an array of information or null on a mismatch. |
| search | A String method that tests for a match in a string. It returns the index of the match, or -1 if the search fails. |
| replace | A String method that executes a search for a match in a string, and replaces the matched substring with a replacement substring. |
| split | A String method that uses a regular expression or a fixed string to break a string into an array of substrings. |
lastIndex — The index at which to start the next match (Gecko only).
Дата публикования: 2015-01-13; Прочитано: 320 | Нарушение авторского права страницы | Мы поможем в написании вашей работы!
