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    正则表达式

    正则表达式是被用来匹配字符串中的字符组合的模式。在JavaScript中,正则表达式也是对象。这种模式可以被用于RegExpexectest方法以及 Stringmatchreplacesearchsplit方法。这一章介绍Javascript的正则表达式。

    创建一个正则表达式

    通过下面两种方法你可以创建一个正则表达式:

    • 使用一个正则表达式字面量,如下所示:
      var re = /ab+c/;
      

      正则表达式字面量在脚本加载后编译。若你的正则表达式是常量,使用这种方式可以获得更好的性能。

    • 调用RegExp对象的构造函数,如下所示:
      var re = new RegExp("ab+c");
      

      使用构造函数,提供了对正则表达式运行时的编译。当你知道正则表达式的模式会发生改变, 或者你事先并不了解它的模式或者是从其他地方(比如用户的输入),得到的代码这时比较适合用构造函数的方式。

    编写一个正则表达式的模式

    一个正则表达式模式是由简单的字符所构成的,比如/abc/, 或者是简单和特殊字符的组合,比如 /ab*c/ or /Chapter (\d+)\.\d*/. 最后一个例子用到了括号,它在正则表达式中可以被用做是一个记忆设备。这一部分正则所匹配的字符将会被记住,在后面可以被利用。正如 Using Parenthesized Substring Matches

    使用简单的模式

    简单的模式是有你找到的直接匹配所构成的。比如,/abc/这个模式就匹配了在一个字符串中,仅仅字符'abc'同时出现并按照这个顺序。在Hi, do you know your abc's?" 和 "The latest airplane designs evolved from slabcraft."就会匹配成功。在上面的两个实例中,匹配的是子字符串‘abc’。在字符串"Grab crab"中将不会被匹配,因为它不包含任何的‘abc’子字符串。

    使用特殊字符

    选择一个匹配需要比直接匹配需要跟多的条件的时候,比如寻找一个或多个b's,或者寻找空格,那么这时模式将要包含特殊字符。比如, 模式/ab*c/匹配了一个单独的‘a’后面跟了零个或则多个b(*的意思是前面一项出现了零个或者多个),且后面跟着‘c’的任何字符组合。在字符串“cbbabbbbcdebc,”中,这个模式匹配了子字符串'abbbbc'。

    下面的表格列出了一个我们在正则表达式中可以利用的特殊字符的完整列表和描述。

    Table 4.1 Special characters in regular expressions.
    Character Meaning
    \

    匹配下面之一

    • 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.
    • 对于字符来说,它们常常被当做字面量处理,暗示着接着的字符是特殊的和不能够被直接解析的。
    • 比如,/b/匹配了字符'b'.通过在b的前面放一个反斜杠,即用作/\b/,这个字符变成了一个特殊意义的字符,意思是匹配一个word boundary character
    • For characters that are usually treated specially, indicates that the next character is not special and should be interpreted literally.对于常常被当做的特殊字符是,暗示接着的字符是特殊的应该被直接的解析。
    • For example, * is a special character that means 0 or more occurrences of the preceding item should be matched; for example, /a*/ means match 0 or more a's. To match * literally, precede it with a backslash; for example, /a\*/ matches 'a*'.
    • 比如,* 是一个代表着前一项0次或多次发生时将会被匹配的特殊字符;比如,/a*/代表会匹配0个或者多个a。为了匹配*号直接量,在它的前面加一个反斜杠;比如,/a\*/匹配'a*'
    • Also do not forget to escape \ itself while using the new RegExp("pattern") notation since \ is also an escape character in strings.
    • 当使用new RegExp("pattern")方法的时候不要忘记将\它自己进行转义,因为\在字符串里面也是一个转义字符。
    ^

    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 'A' in "An E".


    This character has a different meaning when it appears as the first character in a character set pattern.

    For example, /[^a-z\s]/ matches the '3' in "my 3 sisters".

    匹配输入的开始。如果多行标示被设置为true,同时匹配换行后紧跟的字符。

    比如,/^A/并不会匹配“an A”中的‘A’,但是会匹配“An E”中的‘A’。

    当这个字符出现在一个字符集合模式的第一个字符的时候,它将会有不同的意义。

    比如,/[^a-z\s]/会匹配“my 3 sisters”中的‘3’

    $

    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".

    匹配输入的结束,如果多行标示被设置为true,同时会匹配换行前紧跟的字符。

    比如,/t$/并不会匹配“eater”中的‘t’,但是会匹配“eat”中的。

    *

    Matches the preceding character 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".

    匹配前一个字符0次或者是多次。

    比如,/bo*/会匹配“A ghost boooooed”中的'boooo'和‘A bird warbled’中的‘b’,但是在“A goat grunted”中将不会匹配任何东西。

    +

    Matches the preceding character 1 or more times. Equivalent to {1,}.

    匹配前面一个字符1次或者多次,和{1,}有相同的效果。

    For example, /a+/ matches the 'a' in "candy" and all the a's in "caaaaaaandy".

    比如,/a+/匹配了在“candy”中的a,和在"caaaaaaandy"中所有的a。

    ?

    Matches the preceding character 0 or 1 time. Equivalent to {0,1}.

    For example, /e?le?/ matches the 'el' in "angel" and the 'le' in "angle" and also the 'l' in "oslo".

    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). For example, using /\d+/ non-global match "123abc" return "123", if using /\d+?/, only "1" will be matched.

    Also used in lookahead assertions, described under x(?=y) and x(?!y) in this table.

    匹配前面一个字符0次或者1次,和{0,1}有相同的效果。

    比如,/e?le?/匹配“angel”中的‘el’,和"angle"中的‘le’以及“oslo”中的'l'。

    如果'?'紧跟在在任何量词*, + , ?,或者是{}的后面,将会使量词变成非贪婪模式(匹配最少的次数),和默认的贪婪模式(匹配最多的次数)正好相反。比如,使用/\d+/非全局的匹配“123abc”将会返回“123”,如果使用/\d+?/,那么久只会匹配到“1”。

    同时运用在向前断言,在本表的x(?=y)和x(?!y)中有描述。

    .

    (The decimal point) matches any single character except the newline character.

    (小数点)匹配任何除了新一行字符的任何单个字符。

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

    比如,/.n/将会匹配‘nay, an apple is on the tree’中的‘an’和‘on’,但是不会匹配'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].

    匹配‘x’并且记住匹配项。这个被叫做捕获括号。

    比如,/(foo)/匹配和记住了“foo bar”中的'foo'。匹配到子字符串可以通过结果数组的[1],...,[n]元素进行访问。

    (?: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].

    匹配'x'但是不记住匹配项。这种被叫做非捕获括号。匹配到的子字符串不能通过结果数组的[1],...,[n]进行访问。

    x(?=y)

    Matches 'x' only if 'x' is followed by 'y'. This is called a lookahead.

    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.

    匹配'x'仅仅当'x'后面跟着'y'.这种叫做向后查询。

    比如,/Jack(?=Sprat)/会匹配到'Jack'仅仅当它后面跟着'Sprat'。/Jack(?=Sprat|Frost)/匹配‘Jack’仅仅当它后面跟着'Sprat'或者是‘Frost’。但是‘Sprat’和‘Frost’都不是匹配结果的一部分。

    x(?!y)

    Matches 'x' only if 'x' is not followed by 'y'. This is called a negated lookahead.

    For example, /\d+(?!\.)/ matches a number only if it is not followed by a decimal point. The regular expression /\d+(?!\.)/.exec("3.141") matches '141' but not '3.141'.

    匹配'x'仅仅当'x'后面不跟着'y',这个被叫反向向前查找。

    比如,/\d+(?!\.)/匹配一个数字仅仅当这个数字后面没有跟小数点的时候。正则表达式/\d+(?!\.)/.exec("3.141")匹配‘141’但是不是‘3.141’

    x|y

    Matches either 'x' or 'y'.

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

    匹配‘x’或者‘y’。

    比如,/green|red/匹配“green apple”中的‘greem’和“red apple”中的‘red’

    {n}

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

    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是一个正数,匹配了前面一个字符刚好发生了n次。

    比如,/a{2}/不会匹配“candy”中的'a',但是会匹配“caandy”中所有的a,和“caaandy”中的前两个'a'。

    {n,m}

    n 和 m 都是正整数。匹配前面的字符至少n次,最多m次。如果 n 或者 m 的值是0, 这个值被忽略。

    例如,/a{1, 3}/ 并不匹配“cndy”中得任意字符,匹配“candy”中得a,匹配“caandy”中得前两个a,也匹配“caaaaaaandy”中得前三个a。注意,当匹配”caaaaaaandy“时,匹配的值是“aaa”,即使原始的字符串中有更多的a。

    [xyz]

    一个字符集合。匹配方括号的中任意字符。你可以使用破折号(-)来指定一个字符范围。对于点(.)和星号(*)这样的特殊符号在一个字符集中没有特殊的意义。他们不必进行转意,不过转意也是起作用的。

    例如,[abcd] 和[a-d]是一样的。他们都匹配"brisket"中得‘b’,也都匹配“city”中的‘c’。/[a-z.]+/ 和/[\w.]+/都匹配“test.i.ng”中得所有字符。

    [^xyz]

    一个反向字符集。也就是说, 它匹配任何没有包含在方括号中的字符。你可以使用破折号(-)来指定一个字符范围。任何普通字符在这里都是起作用的。

    例如,[^abc] 和 [^a-c] 是一样的。他们匹配"brisket"中得‘r’,也匹配“chop”中的‘h’。

    [\b]

    匹配一个退格(U+0008)。(不要和\b混淆了。)

    \b

    匹配一个词的边界。一个词的边界就是一个词不被另外一个词跟随的位置或者不是另一个词汇字符前边的位置。注意,一个匹配的词的边界并不包含在匹配的内容中。换句话说,一个匹配的词的边界的内容的长度是0。(不要和[\b]混淆了)

    例子:

    /\bm/匹配“moon”中得‘m’;

    /oo\b/并不匹配"moon"中得'oo',因为'oo'被一个词汇字符'n'紧跟着。

    /oon\b/匹配"moon"中得'oon',因为'oon'是这个字符串的结束部分。这样他没有被一个词汇字符紧跟着。

    /\w\b\w/将不能匹配任何字符串,因为一个单词中的字符永远也不可能被一个非词汇字符和一个词汇字符同时紧跟着。

    \B

    Matches a non-word boundary. This matches a position where the previous and next character are of the same type: Either both must be words, or both must be non-words. The beginning and end of a string are considered non-words.

    匹配一个非单词边界。他匹配一个前后字符都是相同类型的位置:都是单词或者都不是单词。一个字符串的开始和结尾都被认为是非单词。

    For example, /\B../ matches 'oo' in "noonday" (, and /y\B./ matches 'ye' in "possibly yesterday."

    例如,/\B../匹配"noonday"中得'oo', 而/y\B./匹配"possibly yesterday"中得’ye‘

    \cX

    Where X is a character ranging from A to Z. Matches a control character in a string.

    For example, /\cM/ matches control-M (U+000D) in a string.

    \d

    Matches a digit character. Equivalent to [0-9].

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

    \D

    Matches any non-digit character. Equivalent to [^0-9].

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

    \f Matches a form feed (U+000C).
    \n Matches a line feed (U+000A).
    \r Matches a carriage return (U+000D).
    \s

    Matches a single white space character, including space, tab, form feed, line feed. Equivalent to [ \f\n\r\t\v​\u00A0\u1680​\u180e\u2000​\u2001\u2002​\u2003\u2004​\u2005\u2006​\u2007\u2008​\u2009\u200a​\u2028\u2029​\u2028\u2029​\u202f\u205f​\u3000].

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

    \S

    Matches a single character other than white space. Equivalent to [^ \f\n\r\t\v​\u00A0\u1680​\u180e\u2000​\u2001\u2002​\u2003\u2004​\u2005\u2006​\u2007\u2008​\u2009\u200a​\u2028\u2029​\u2028\u2029​\u202f\u205f​\u3000].

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

    \t Matches a tab (U+0009).
    \v Matches a vertical tab (U+000B).
    \w

    Matches any 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-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."

    \0 Matches a NULL (U+0000) character. Do not follow this with another digit, because \0<digits> is an octal escape sequence.
    \xhh Matches the character with the code hh (two hexadecimal digits)
    \uhhhh Matches the character with the code hhhh (four hexadecimal digits).

    Escaping user input to be treated as a literal string within a regular expression can be accomplished by simple replacement:

    function escapeRegExp(string){
      return string.replace(/([.*+?^=!:${}()|[\]\/\\])/g, "\\$1");
    }

    Using Parentheses

    Parentheses around any part of the regular expression pattern cause that part of the matched substring to be remembered. Once remembered, the substring can be recalled for other use, as described in Using Parenthesized Substring Matches.

    For example, the pattern /Chapter (\d+)\.\d*/ illustrates additional escaped and special characters and indicates that part of the pattern should be remembered. It matches precisely the characters 'Chapter ' followed by one or more numeric characters (\d means any numeric character and + means 1 or more times), followed by a decimal point (which in itself is a special character; preceding the decimal point with \ means the pattern must look for the literal character '.'), followed by any numeric character 0 or more times (\d means numeric character, * means 0 or more times). In addition, parentheses are used to remember the first matched numeric characters.

    This pattern is found in "Open Chapter 4.3, paragraph 6" and '4' is remembered. The pattern is not found in "Chapter 3 and 4", because that string does not have a period after the '3'.

    To match a substring without causing the matched part to be remembered, within the parentheses preface the pattern with ?:. For example, (?:\d+) matches one or more numeric characters but does not remember the matched characters.

    Working with Regular Expressions

    Regular expressions are used with the RegExp methods test and exec and with the String methods match, replace, search, and split. These methods are explained in detail in the JavaScript Reference.

    Table 4.2 Methods that use regular expressions
    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.

    When you want to know whether a pattern is found in a string, use the test or search method; for more information (but slower execution) use the exec or match methods. If you use exec or match and if the match succeeds, these methods return an array and update properties of the associated regular expression object and also of the predefined regular expression object, RegExp. If the match fails, the exec method returns null (which converts to false).

    In the following example, the script uses the exec method to find a match in a string.

    var myRe = /d(b+)d/g;
    var myArray = myRe.exec("cdbbdbsbz");
    

    If you do not need to access the properties of the regular expression, an alternative way of creating myArray is with this script:

    var myArray = /d(b+)d/g.exec("cdbbdbsbz");
    

    If you want to construct the regular expression from a string, yet another alternative is this script:

    var myRe = new RegExp("d(b+)d", "g");
    var myArray = myRe.exec("cdbbdbsbz");
    

    With these scripts, the match succeeds and returns the array and updates the properties shown in the following table.

    Table 4.3 Results of regular expression execution.
    Object Property or index Description In this example
    myArray   The matched string and all remembered substrings. ["dbbd", "bb"]
    index The 0-based index of the match in the input string. 1
    input The original string. "cdbbdbsbz"
    [0] The last matched characters. "dbbd"
    myRe lastIndex The index at which to start the next match. (This property is set only if the regular expression uses the g option, described in Advanced Searching With Flags.) 5
    source The text of the pattern. Updated at the time that the regular expression is created, not executed. "d(b+)d"

    As shown in the second form of this example, you can use a regular expression created with an object initializer without assigning it to a variable. If you do, however, every occurrence is a new regular expression. For this reason, if you use this form without assigning it to a variable, you cannot subsequently access the properties of that regular expression. For example, assume you have this script:

    var myRe = /d(b+)d/g;
    var myArray = myRe.exec("cdbbdbsbz");
    console.log("The value of lastIndex is " + myRe.lastIndex);
    

    This script displays:

    The value of lastIndex is 5
    

    However, if you have this script:

    var myArray = /d(b+)d/g.exec("cdbbdbsbz");
    console.log("The value of lastIndex is " + /d(b+)d/g.lastIndex);
    

    It displays:

    The value of lastIndex is 0
    

    The occurrences of /d(b+)d/g in the two statements are different regular expression objects and hence have different values for their lastIndex property. If you need to access the properties of a regular expression created with an object initializer, you should first assign it to a variable.

    Using Parenthesized Substring Matches

    Including parentheses in a regular expression pattern causes the corresponding submatch to be remembered. For example, /a(b)c/ matches the characters 'abc' and remembers 'b'. To recall these parenthesized substring matches, use the Array elements [1], ..., [n].

    The number of possible parenthesized substrings is unlimited. The returned array holds all that were found. The following examples illustrate how to use parenthesized substring matches.

    Example 1

    The following script uses the replace() method to switch the words in the string. For the replacement text, the script uses the $1 and $2 in the replacement to denote the first and second parenthesized substring matches.

    var re = /(\w+)\s(\w+)/;
    var str = "John Smith";
    var newstr = str.replace(re, "$2, $1");
    console.log(newstr);
    

    This prints "Smith, John".

    Advanced Searching With Flags

    Regular expressions have four optional flags that allow for global and case insensitive searching. To indicate a global search, use the g flag. To indicate a case-insensitive search, use the i flag. To indicate a multi-line search, use the m flag. To perform a "sticky" search, that matches starting at the current position in the target string, use the y flag. These flags can be used separately or together in any order, and are included as part of the regular expression.

    Firefox 3 note

    Support for the y flag was added in Firefox 3. The y flag fails if the match doesn't succeed at the current position in the target string.

    To include a flag with the regular expression, use this syntax:

    var re = /pattern/flags;
    

    or

    var re = new RegExp("pattern", "flags");
    

    Note that the flags are an integral part of a regular expression. They cannot be added or removed later.

    For example, re = /\w+\s/g creates a regular expression that looks for one or more characters followed by a space, and it looks for this combination throughout the string.

    var re = /\w+\s/g;
    var str = "fee fi fo fum";
    var myArray = str.match(re);
    console.log(myArray);
    

    This displays ["fee ", "fi ", "fo "]. In this example, you could replace the line:

    var re = /\w+\s/g;
    

    with:

    var re = new RegExp("\\w+\\s", "g");
    

    and get the same result.

    The m flag is used to specify that a multiline input string should be treated as multiple lines. If the m flag is used, ^ and $ match at the start or end of any line within the input string instead of the start or end of the entire string.

    Examples

    The following examples show some uses of regular expressions.

    Changing the Order in an Input String

    The following example illustrates the formation of regular expressions and the use of string.split() and string.replace(). It cleans a roughly formatted input string containing names (first name first) separated by blanks, tabs and exactly one semicolon. Finally, it reverses the name order (last name first) and sorts the list.

    // The name string contains multiple spaces and tabs,
    // and may have multiple spaces between first and last names.
    var names = "Harry Trump ;Fred Barney; Helen Rigby ; Bill Abel ; Chris Hand ";
    
    var output = ["---------- Original String\n", names + "\n"];
    
    // Prepare two regular expression patterns and array storage.
    // Split the string into array elements.
    
    // pattern: possible white space then semicolon then possible white space
    var pattern = /\s*;\s*/;
    
    // Break the string into pieces separated by the pattern above and
    // store the pieces in an array called nameList
    var nameList = names.split(pattern);
    
    // new pattern: one or more characters then spaces then characters.
    // Use parentheses to "memorize" portions of the pattern.
    // The memorized portions are referred to later.
    pattern = /(\w+)\s+(\w+)/;
    
    // New array for holding names being processed.
    var bySurnameList = [];
    
    // Display the name array and populate the new array
    // with comma-separated names, last first.
    //
    // The replace method removes anything matching the pattern
    // and replaces it with the memorized string—second memorized portion
    // followed by comma space followed by first memorized portion.
    //
    // The variables $1 and $2 refer to the portions
    // memorized while matching the pattern.
    
    output.push("---------- After Split by Regular Expression");
    
    var i, len;
    for (i = 0, len = nameList.length; i < len; i++){
      output.push(nameList[i]);
      bySurnameList[i] = nameList[i].replace(pattern, "$2, $1");
    }
    
    // Display the new array.
    output.push("---------- Names Reversed");
    for (i = 0, len = bySurnameList.length; i < len; i++){
      output.push(bySurnameList[i]);
    }
    
    // Sort by last name, then display the sorted array.
    bySurnameList.sort();
    output.push("---------- Sorted");
    for (i = 0, len = bySurnameList.length; i < len; i++){
      output.push(bySurnameList[i]);
    }
    
    output.push("---------- End");
    
    console.log(output.join("\n"));
    

    Using Special Characters to Verify Input

    In the following example, the user is expected to enter a phone number. When the user presses the "Check" button, the script checks the validity of the number. If the number is valid (matches the character sequence specified by the regular expression), the script shows a message thanking the user and confirming the number. If the number is invalid, the script informs the user that the phone number is not valid at all.

    The regular expression looks for zero or one open parenthesis \(?, followed by three digits \d{3}, followed by zero or one close parenthesis \)?, followed by one dash, forward slash, or decimal point and when found, remember the character ([-\/\.]), followed by three digits \d{3}, followed by the remembered match of a dash, forward slash, or decimal point \1, followed by four digits \d{4}.

    The Change event activated when the user presses Enter sets the value of RegExp.input.

    <!DOCTYPE html>
    <html>  
      <head>  
        <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">  
        <meta http-equiv="Content-Script-Type" content="text/javascript">  
        <script type="text/javascript">  
          var re = /\(?\d{3}\)?([-\/\.])\d{3}\1\d{4}/;  
          function testInfo(phoneInput){  
            var OK = re.exec(phoneInput.value);  
            if (!OK)  
              window.alert(RegExp.input + " isn't a phone number with area code!");  
            else
              window.alert("Thanks, your phone number is " + OK[0]);  
          }  
        </script>  
      </head>  
      <body>  
        <p>Enter your phone number (with area code) and then click "Check".
            <br>The expected format is like ###-###-####.</p>
        <form action="#">  
          <input id="phone"><button onclick="testInfo(document.getElementById('phone'));">Check</button>
        </form>  
      </body>  
    </html>
    

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