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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/javascript/reference/errors/bad_regexp_flag | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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diff --git a/files/zh-cn/web/javascript/reference/errors/bad_regexp_flag/index.html b/files/zh-cn/web/javascript/reference/errors/bad_regexp_flag/index.html new file mode 100644 index 0000000000..6365649479 --- /dev/null +++ b/files/zh-cn/web/javascript/reference/errors/bad_regexp_flag/index.html @@ -0,0 +1,104 @@ +--- +title: 'SyntaxError: invalid regular expression flag "x"' +slug: Web/JavaScript/Reference/Errors/Bad_regexp_flag +tags: + - 语法错误 + - 错误 +translation_of: Web/JavaScript/Reference/Errors/Bad_regexp_flag +--- +<div>{{jsSidebar("Errors")}}</div> + +<h2 id="信息">信息</h2> + +<pre class="syntaxbox">SyntaxError: invalid regular expression flag "x" (Firefox) +SyntaxError: Invalid regular expression flags (Chrome) +</pre> + +<h2 id="错误类型">错误类型</h2> + +<p>{{jsxref("SyntaxError","语法错误")}}.</p> + +<h2 id="什么地方出错了">什么地方出错了?</h2> + +<p>在代码中出现了无效的正则表达式的标记。在一个正则表达式字面量中,由闭合的两条斜线组成一个模式,(正则表达式的)标记定义在第二个(斜线)标记之后。他们也可以通过{{jsxref("RegExp", "正则表达式")}} 对象的构造函数(第二个参数)来定义。正则表达式的标记可以单独或者任意次序的组合使用,但ECMAScript只规定了五个。</p> + +<p>要使正则表达式包含标记,使用此语法:</p> + +<pre class="brush: js">var re = /pattern/flags; +</pre> + +<p>或</p> + +<pre class="brush: js">var re = new RegExp('pattern', 'flags');</pre> + +<table class="standard-table"> + <caption>正则表达式标记</caption> + <thead> + <tr> + <th scope="col">标记</th> + <th scope="col">说明</th> + </tr> + </thead> + <tbody> + <tr> + <td><code>g</code></td> + <td>整体检索.</td> + </tr> + <tr> + <td>i</td> + <td>忽略大小写检索.</td> + </tr> + <tr> + <td>m</td> + <td>多行检索.</td> + </tr> + <tr> + <td>u</td> + <td>Unicode; 将模式视为Unicode码点的序列</td> + </tr> + <tr> + <td>y</td> + <td>sticky 检索将从目标字符串的当前位置开始匹配。参阅{{jsxref("RegExp.sticky", "sticky")}}</td> + </tr> + </tbody> +</table> + +<h2 id="示例">示例</h2> + +<p>只有5个有效的正则表达式标记。</p> + +<pre class="brush: js example-bad">/foo/bar; + +// SyntaxError: invalid regular expression flag "b" +</pre> + +<p>你打算创建一个正则表达式吗?一个包含两条斜线的表达式被解释为一个正则表达式的字面量。</p> + +<pre class="brush: js example-bad">let obj = { + url: /docs/Web +}; + +// SyntaxError: invalid regular expression flag "W" +</pre> + +<p>还是你想创建一个字符串呢?添加单引号或双引号创建一个字符串字面量。</p> + +<pre class="brush: js example-good">let obj = { + url: '/docs/Web' +};</pre> + +<h3 id="有效的正则表达式标记">有效的正则表达式标记</h3> + +<p>在JavaScript中允许的五个有效的正则表达式标记,参阅上表。</p> + +<pre class="brush: js example-good">/foo/g; +/foo/gim; +/foo/uy; +</pre> + +<h2 id="相关页面">相关页面</h2> + +<ul> + <li><a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Regular_Expressions">正则表达式</a></li> + <li><a href="http://xregexp.com/flags/">XRegEx flags</a> – 正则表达式库提供新的四个标记(<code>n</code>, <code>s</code>, <code>x</code>, <code>A</code>)</li> +</ul> |