Html 正则表达式 - 仅第一个字符检查非字母字符
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Regular Expression - Only first character check non-letter characters
提问by A. Mesut Konuklar
I've started to study on javascript and regexp specially. I am trying to improve myself on generating regular expressions.
我已经开始专门研究 javascript 和 regexp。我正在努力提高自己生成正则表达式的能力。
What I am trying to do is - I have a name field in my html file (its in a form ofc)
我想要做的是 - 我的 html 文件中有一个 name 字段（它的形式为 ofc）
...
<label for="txtName">Your Name*: </label>
<input id="txtName" type="text" name="txtName" size="30" maxlength="40">
...
And in my js file I am trying to check name cannot start with any NON-letter character, only for the first character. And whole field cannoth contain any special character other than dash and space.
在我的 js 文件中，我试图检查名称不能以任何非字母字符开头，仅适用于第一个字符。并且整个字段不能包含除破折号和空格之外的任何特殊字符。
They cannot start with any non-letter character ;
它们不能以任何非字母字符开头；
/^[A-Z a-z][A-Z a-z 0-9]*$/
They cannot contain any symbol other than dash and space ;
它们不能包含除破折号和空格之外的任何符号；
/^*[[&-._].*]{1,}$/
When I am testing if it works, it doesn't work at all. In which part am I failing ?
当我测试它是否有效时，它根本不起作用。我在哪部分失败了？
回答by Trenton Trama
Try /^[A-Za-z][A-Za-z0-9 -]*$/
When you include a space in the character listing ([]), it's going to be allowed in the string that's being searched.
尝试/^[A-Za-z][A-Za-z0-9 -]*$/
在字符列表 ( []) 中包含空格时，将允许在正在搜索的字符串中使用空格。
^[A-Za-z]matches the first character and says that it must be a letter of some sort.[A-Za-z0-9 -]*$will match any remaining characters(if they exist) after the first character and make sure it's alpha numeric, or contains spaces or dashes.
^[A-Za-z]匹配第一个字符并说它必须是某种字母。[A-Za-z0-9 -]*$将匹配第一个字符之后的任何剩余字符（如果存在），并确保它是字母数字，或者包含空格或破折号。
