正则表达式的一点帮助 [英] A little Help in Regular Expressions

问题描述

'/ ^ [az，ñ] +（（ - |）？[az，ñ] +）+（（ - |）？[az，ñ] +）？$ / i'



如果我只输入1个字符，为什么不接受？

'/^[a-z,ñ]+((-| )?[a-z,ñ]+)+((-| )?[a-z,ñ]+)?$/i'

Why doesn't it accept if i only input 1 character?

推荐答案

/ i'



如果我只输入1个字符，为什么不接受？

/i'

Why doesn't it accept if i only input 1 character?

简单：你告诉它不要！



如果我压缩一点可能会更明显一点：

Simple: you have told it not to!

If I compact this a bit it may be a bit more obvious:

^x+y+(z+)?

其中x，y和z是你的正则表达式中的短语。

这需要一个或多个x，然后是一个或更多y，然后一个或多个z - 至少三个字符。



我不知道你到底要做什么，所以我无法开始纠正它，但获得 Expresso 的副本[ ^ ] - 它是免费的，它会检查并生成正则表达式。这将使问题显而易见！

Where x, y, and z are the "phrases" in your regex.
That requires "one or more x", then "one or more y", then "one or more z" - a minimum of three characters.

I don't know exactly what you are trying to achieve, so I can't begin to correct it, but get a copy of Expresso [^] - it's free, and it examines and generates Regular expressions. It will make it pretty obvious what the problem is!

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