javascipt 正則表達式英文版
更新時間：2010年02月24日 19:22:08 作者：
javascript 正則 原語
1. Regular-expression literal characters Character Matches
Alphanumeric character Itself
\0 The NUL character (\u0000)
\t Tab (\u0009)
\n Newline (\u000A)
\v Vertical tab (\u000B)
\f Form feed (\u000C)
\r Carriage return (\u000D)
\xnn The Latin character specified by the hexadecimal number nn; for example, \x0A is the same as \n
\uxxxx The Unicode character specified by the hexadecimal number xxxx; for example, \u0009 is the same as \t
\cX The control character ^X; for example, \cJ is equivalent to the newline character \n
2. Regular expression character classes Character Matches
[...] Any one character between the brackets.
[^...] Any one character not between the brackets.
. Any character except newline or another Unicode line terminator.
\w Any ASCII word character. Equivalent to [a-zA-Z0-9_].
\W Any character that is not an ASCII word character. Equivalent to [^a-zA-Z0-9_].
\s Any Unicode whitespace character.
\S Any character that is not Unicode whitespace. Note that \w and \S are not the same thing.
\d Any ASCII digit. Equivalent to [0-9].
\D Any character other than an ASCII digit. Equivalent to [^0-9].
[\b] A literal backspace (special case).
3. Regular expression repetition characters Character Meaning
{n,m} Match the previous item at least n times but no more than m times.
{n,} Match the previous item n or more times.
{n} Match exactly n occurrences of the previous item.
? Match zero or one occurrences of the previous item. That is, the previous item is optional. Equivalent to {0,1}.
+ Match one or more occurrences of the previous item. Equivalent to {1,}.
* Match zero or more occurrences of the previous item. Equivalent to {0,}.
4。 Regular expression alternation, grouping, and reference characters Character Meaning
| Alternation. Match either the subexpression to the left or the subexpression to the right.
(...) Grouping. Group items into a single unit that can be used with *, +, ?, |, and so on. Also remember the characters that match this group for use with later references.
(?:...) Grouping only. Group items into a single unit, but do not remember the characters that match this group.
\n Match the same characters that were matched when group number n was first matched. Groups are subexpressions within (possibly nested) parentheses. Group numbers are assigned by counting left parentheses from left to right. Groups formed with (?: are not numbered.
5. Regular-expression anchor characters Character Meaning
^ Match the beginning of the string and, in multiline searches, the beginning of a line.
$ Match the end of the string and, in multiline searches, the end of a line.
\b Match a word boundary. That is, match the position between a \w character and a \W character or between a \w character and the beginning or end of a string. (Note, however, that [\b] matches backspace.)
\B Match a position that is not a word boundary.
(?=p) A positive lookahead assertion. Require that the following characters match the pattern p, but do not include those characters in the match.
(?!p) A negative lookahead assertion. Require that the following characters do not match the pattern p.
6. Regular-expression flags Character Meaning
i Perform case-insensitive matching.
g Perform a global matchthat is, find all matches rather than stopping after the first match.
m Multiline mode. ^ matches beginning of line or beginning of string, and $ matches end of line or end of string.
string.replace(regexp, replacement)
Characters Replacement
$1, $2, ..., $99 The text that matched the 1st through 99th parenthesized subexpression within regexp
$& The substring that matched regexp
$' The text to the left of the matched substring
$' The text to the right of the matched substring
$$ A literal dollar sign
name.replace(/(\w+)\s*,\s*(\w+)/, "$2 $1");
text.replace(/"([^"]*)"/g, "''$1''");
text.replace(/\b\w+\b/g, function(word) {
return word.substring(0,1).toUpperCase( ) +
word.substring(1);
});
相關文章
昨天Snopo問我如何寫一段正則表達式，來提取sql的條件語句。解答之余，想寫一篇文章介紹一下經(jīng)驗2012-09-09
Javascript中使用exec進行正則表達式全局匹配時的注意事項
在 Javascript 中使用 exec 進行正則表達式全局匹配時，有一個非常容易犯的錯誤，這是因為 exec() 在全局模式下的行為稍微有點復雜2011-11-11
如果你曾經(jīng)用過Perl或任何其他內(nèi)建正則表達式支持的語言，你一定知道用正則表達式處理文本和匹配模式是多么簡單。2008-12-12
JavaScript email郵箱/郵件地址的正則表達式及分析
在做用戶注冊時，常會用到郵箱/郵件地址的正則表達式。本文列舉了幾種方案，大家可以根據(jù)自己的項目情況，選擇最適合的方案2018-03-03
JS通過正則限制 input 輸入框只能輸入整數(shù)、小數(shù)(金額或者現(xiàn)金) 兩位小數(shù)
這篇文章主要介紹了JS通過正則限制 input 輸入框只能輸入整數(shù)、小數(shù)(金額或者現(xiàn)金) 兩位小數(shù)的相關資料,需要的朋友可以參考下2016-05-05
RegExp 隨筆 JavaScript RegExp 對象
這篇文章主要介紹了RegExp 隨筆 JavaScript RegExp 對象,需要的朋友可以參考下2016-10-10
javascript中基于replace函數(shù)的正則表達式語法
replace()最js中比較簡單的字符替換函數(shù)，但是它也是可以跟正則結合實現(xiàn)強大的字符替換效果。2011-02-02
這篇文章主要介紹了正則表達式中的正向預查和負向預查，本文通過幾個場景給大家分析 ,需要的朋友可以參考下2019-08-08
正則替換實現(xiàn)輸入框只能有數(shù)字、中英文逗號
最近在開發(fā)過程中，需要一個輸入框里面只能有數(shù)字與中英文逗號，因為是相關文章，其它的也不讓出現(xiàn)，容易造成問題，編程容易把介紹復制到里面，所以想到了這個方法2016-05-05
無聊的周末，天氣非常冷，閑著沒事做，正好練練正則表達式吧，暖暖手，涉及到php正則表達式工具類相關知識，本文介紹的非常詳細，感興趣的朋友一起看看吧2015-11-11