<rt id="bn8ez"></rt>
<label id="bn8ez"></label>

  • <span id="bn8ez"></span>

    <label id="bn8ez"><meter id="bn8ez"></meter></label>

    wiflish
    Loving Life! Loving Coding!
    posts - 98,comments - 98,trackbacks - 0
    參考鏈接:http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Objects:RegExp

    1、創(chuàng)建方法:
    var regExp = /pattern/flags.
    or
    var regExp = new RegExp("pattern"[, "flags"]);

    flags取值: g - global match, i - ignore case, m - match over multiple lines.

    2、Special characters in regular expressions

    Character? Meaning
    \

    For characters that are usually treated literally, indicates that the next character is special and not to be interpreted literally.

    For example, /b/ matches the character 'b'. By placing a backslash in front of b, that is by using /\b/, the character becomes special to mean match a word boundary.

    -or-

    For characters that are usually treated specially, indicates that the next character is not special and should be interpreted literally.

    For example, * is a special character that means 0 or more occurrences of the preceding character should be matched; for example, /a*/ means match 0 or more a's. To match * literally, precede the it with a backslash; for example, /a\*/ matches 'a*'.

    ^

    Matches beginning of input. If the multiline flag is set to true, also matches immediately after a line break character.

    For example, /^A/ does not match the 'A' in "an A", but does match the first 'A' in "An A."

    $

    Matches end of input. If the multiline flag is set to true, also matches immediately before a line break character.

    For example, /t$/ does not match the 't' in "eater", but does match it in "eat".

    *

    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.

    For example, /.n/ matches 'an' and 'on' in "nay, an apple is on the tree", but not 'nay'.

    (x)

    Matches x and remembers the match. These are called capturing parentheses.

    For example, /(foo)/ matches and remembers 'foo' in "foo bar." The matched substring can be recalled from the resulting array's elements [1], ..., [n] or from the predefined RegExp object's properties $1, ..., $9.

    (?:x)

    Matches x but does not remember the match. These are called non-capturing parentheses. The matched substring can not be recalled from the resulting array's elements [1], ..., [n] or from the predefined RegExp object's properties $1, ..., $9.

    x(?=y)

    Matches x only if x is followed by y. For example, /Jack(?=Sprat)/ matches 'Jack' only if it is followed by 'Sprat'. /Jack(?=Sprat|Frost)/ matches 'Jack' only if it is followed by 'Sprat' or 'Frost'. However, neither 'Sprat' nor 'Frost' is part of the match results.

    x(?!y)

    Matches x only if x is not followed by y. For example, /\d+(?!\.)/ matches a number only if it is not followed by a decimal point.

    /\d+(?!\.)/.exec("3.141") matches 141 but not 3.141.

    x|y

    Matches either x or y.

    For example, /green|red/ matches 'green' in "green apple" and 'red' in "red apple."

    {n}

    Where n is a positive integer. Matches exactly n occurrences of the preceding item.

    For example, /a{2}/ doesn't match the 'a' in "candy," but it matches all of the a's in "caandy," and the first two a's in "caaandy."

    {n,}

    Where n is a positive integer. Matches at least n occurrences of the preceding item.

    For example, /a{2,} doesn't match the 'a' in "candy", but matches all of the a's in "caandy" and in "caaaaaaandy."

    {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."

    \B

    Matches a non-word boundary.

    For example, /\w\Bn/ matches 'on' in "noonday", and /y\B\w/ matches 'ye' in "possibly yesterday."

    \cX

    Where X is a letter from A - Z. Matches a control character in a string.

    For example, /\cM/ matches control-M in a string.

    \d

    Matches a digit character from any alphabet. Use [0-9] to match only Basic Latin alphabet digits.

    For example, /\d/ or /[0-9]/ matches '2' in "B2 is the suite number."

    \D

    Matches any non-digit character (all alphabets). [^0-9] is the Basic Latin alphabet equivalent of \D

    For example, /\D/ or /[^0-9]/ matches 'B' in "B2 is the suite number."

    \f

    Matches a form-feed.

    \n

    Matches a linefeed.

    \r

    Matches a carriage return.

    \s

    Matches a single white space character, including space, tab, form feed, line feed and other unicode spaces.[1]

    For example, /\s\w*/ matches ' bar' in "foo bar."

    \S

    Matches a single character other than white space.[2]

    For example, /\S\w*/ matches 'foo' in "foo bar."

    \t

    Matches a tab.

    \v

    Matches a vertical tab.

    \w

    Matches any (Basic Latin alphabet) alphanumeric character including the underscore. Equivalent to [A-Za-z0-9_].

    For example, /\w/ matches 'a' in "apple," '5' in "$5.28," and '3' in "3D."

    \W

    Matches any non-(Basic Latin)word character. Equivalent to [^A-Za-z0-9_].

    For example, /\W/ or /[^$A-Za-z0-9_]/ matches '%' in "50%."

    \n

    Where n is a positive integer. A back reference to the last substring matching the n parenthetical in the regular expression (counting left parentheses).

    For example, /apple(,)\sorange\1/ matches 'apple, orange,' in "apple, orange, cherry, peach." A more complete example follows this table.

    \0

    Matches a NUL character. Do not follow this with another digit.

    \xhh

    Matches the character with the code hh (two hexadecimal digits)

    \uhhhh

    Matches the character with code hhhh


    posted on 2007-08-17 17:15 想飛的魚 閱讀(1028) 評(píng)論(0)  編輯  收藏 所屬分類: web
    主站蜘蛛池模板: 99热免费在线观看| 亚洲A∨无码无在线观看| 成年黄网站色大免费全看| 日韩毛片在线免费观看| 国产禁女女网站免费看| 久久亚洲AV成人无码国产最大| 最近最新中文字幕完整版免费高清 | 亚洲AV午夜成人片| 免费国产黄网站在线观看可以下载| 久久91亚洲人成电影网站| 日本免费在线观看| 亚洲电影在线免费观看| 美女视频黄免费亚洲| 亚洲精品中文字幕| 亚洲XX00视频| 国产偷伦视频免费观看| 亚洲国产成人91精品| 免费网站看v片在线香蕉| 国产亚洲视频在线观看网址| 久99精品视频在线观看婷亚洲片国产一区一级在线 | 免费一级毛片不卡不收费| 免费在线观看自拍性爱视频| 亚洲色无码专区在线观看| 免费国产黄网站在线观看视频| 激情综合亚洲色婷婷五月| 国产成人一区二区三区免费视频| 日韩一级片免费观看| 亚洲Av永久无码精品三区在线| 久久久久av无码免费网| 国产精品亚洲а∨无码播放不卡| 爱情岛论坛网亚洲品质自拍| 18禁成人网站免费观看| 99亚洲男女激情在线观看| 久久久青草青青亚洲国产免观| 国产a视频精品免费观看| 国产亚洲精品欧洲在线观看| 亚洲欧洲日产国码无码久久99| 免费福利视频导航| 国产免费A∨在线播放| 亚洲免费在线视频观看| 2022中文字字幕久亚洲|