Javascript和Regex：获取捕获的字符串的索引 [英] Javascript and Regex: Get index of a captured string

问题描述

这是我的问题：

• 我有一个正则表达式，这个表达式包含一个，只有一个捕获组，


• 此正则表达式无法更改，


• 我有一个字符串，将与此正则表达式匹配，


• 正则表达式将匹配完整的字符串，它不是查找，如果正则表达式不能与字符串匹配，则函数将在到达此步骤之前失败。

• I have a regular expression, this expression contains one, and only one capture group,
• This regular expression cannot be changed,
• I have a string, that will be matched this regular expression,
• The regex will match the complete string, it's not a look-up, if the regex cannot be matched to the string, the function will fail prior reaching this step.

=>我想在字符串中获取捕获的子字符串位置，并且它的长度。

=> I want to get the captured sub-string position in the string, and it's length.

示例;

如果我的正则表达式是

^。*？\ / F？L？（\d +） $

我的字符串是

"( 413) 250/FL250"

我想得到 14 和 3 。

在这些情况下，搜索将返回 1 。

In those conditions, search would return 1.

这是一个简单的例子，但我们可能会非常复杂正则表达式，但原则始终是相同的：一个且只有一个捕获组，并在主要字符串中找到捕获字符串的位置。

This is a simple example, but we can have extremely complex regex, however the principle is always the same: one and only one capture group, and find the position of the captured string in the main one.

非常感谢你的帮助，我被困了。

Thanks a lot for your help, I'm stucked.

EDITION：

所以我用ant做了些什么（我们的基础工作环境是ant），包括获取捕获组的leftContext，然后确定它的大小。为了获得leftContext，我只需在左侧部分移动捕获组的括号。例如：\\\（\ s）变为（\d）\。。

So I made something with ant (our base work environnement is ant) which consist of getting the leftContext of the capture group, then determine it's size. To get the leftContext, I simply move the parenthesis of the capture groupe at the left part. Ex: \d(\s) becomes (\d)\s.

所以我对此有疑问：

<macrodef name="Get_CaptureGroup_Position" >
    <attribute name="text" />
    <attribute name="mask" />
    <attribute name="start" />
    <attribute name="end" />
    <sequential>

        <var name="_GMLCS_modified_regex"       unset="true"/>
        <var name="_GMLCS_leftContext"          unset="true"/>
        <var name="_GMLCS_leftContext_len"      unset="true"/>
        <var name="_GMLCS_CapturedGroup"        unset="true"/>
        <var name="_GMLCS_CapturedGroup_len"    unset="true"/>

        <propertyregex property="_GMLCS_modified_regex" override="yes"  input="@{mask}" regexp="(.*[^\\])\)([^?].*)" replace="\1\2" />  
        <propertyregex property="_GMLCS_modified_regex" override="yes" input="${_GMLCS_modified_regex}" regexp="(.*[^\\])\(([^?].*)" replace="\1)\2" />
        <var name="_GMLCS_modified_regex" value="(${_GMLCS_modified_regex}" />

        <propertyregex property="_GMLCS_leftContext"    override="yes" input="@{text}" regexp="${_GMLCS_modified_regex}" select="\1" />
        <propertyregex property="_GMLCS_CapturedGroup"  override="yes" input="@{text}" regexp="@{mask}" select="\1" />

        <getAttributeLength text="${_GMLCS_leftContext}"    property="_GMLCS_leftContext_len" />
        <getAttributeLength text="${_GMLCS_CapturedGroup}"  property="_GMLCS_CapturedGroup_len" />

        <math result="_GMLCS_leftContext_len"   operation="+" operand1="${_GMLCS_leftContext_len}" operand2="1" />
        <math result="_GMLCS_CapturedGroup_len" operation="+" operand1="${_GMLCS_leftContext_len}" operand2="${_GMLCS_CapturedGroup_len}" />

        <var name="@{start}" value="${_GMLCS_leftContext_len}" />
        <var name="@{end}" value="${_GMLCS_CapturedGroup_len}" />

        <var name="_GMLCS_modified_regex"       unset="true"/>
        <var name="_GMLCS_leftContext"          unset="true"/>
        <var name="_GMLCS_leftContext_len"      unset="true"/>
        <var name="_GMLCS_CapturedGroup"        unset="true"/>
        <var name="_GMLCS_CapturedGroup_len"    unset="true"/>
    </sequential>
</macrodef>

我的问题是，当我通过这个正则表达式时：

My question is that, when I pass this regex:

(?:A|.*)/F?L?(\d+)\s*\d*(?:A|.*)

我得到：

第一个属性正则表达式：

First property regex:

(?:A|.*)/F?L?(\d+\s*\d*(?:A|.*) = CORRECT

第二个propoerty正则表达式：

Second propoerty regex:

(?:A|.*)/F?L?)\d+\s*\d*(?:A|.*) = CORRECT

Var：

((?:A|.*)/F?L?)\d+\s*\d*(?:A|.*) = CORRECT

开始和结束：7和10 =正确。

Start and End: 7 and 10 = CORRECT.

这实际上是正确的，但我相信它不应该是，我的问题是为什么（？：...）块末尾的）没有删除？

This is actually correct, but I believe it should not be, my question is why the ")" at the end of (?:...) blocks were not removed ?

推荐答案

这是我们对这个问题的最终答案。
这是由ANT完成的，但我认为它可以转换为javascript：

Here the final answer we have for our issue. It's done by ANT, but I think it is transposable to javascript:

<macrodef name="Get_CaptureGroup_Position" >
<attribute name="text" />
<attribute name="mask" />
<attribute name="start" />
<attribute name="end" />
<sequential>

    <var name="_GMLCS_modified_regex"       unset="true"/>
    <var name="_GMLCS_leftContext"          unset="true"/>
    <var name="_GMLCS_leftContext_len"      unset="true"/>
    <var name="_GMLCS_CapturedGroup"        unset="true"/>
    <var name="_GMLCS_CapturedGroup_len"    unset="true"/>

    <propertyregex property="_GMLCS_modified_regex" override="yes" input="@{mask}" regexp="^((?:|(?:[^\\]|\\.)*))\(([^?].*)$" replace="(\1\2" />

    <propertyregex property="_GMLCS_leftContext"    override="yes" input="@{text}" regexp="${_GMLCS_modified_regex}" select="\1" />
    <propertyregex property="_GMLCS_CapturedGroup"  override="yes" input="@{text}" regexp="@{mask}" select="\1" />

    <getAttributeLength text="${_GMLCS_leftContext}"    property="_GMLCS_leftContext_len" />
    <getAttributeLength text="${_GMLCS_CapturedGroup}"  property="_GMLCS_CapturedGroup_len" />

    <math result="@{start}" operation="-" operand1="${_GMLCS_leftContext_len}" operand2="${_GMLCS_CapturedGroup_len}" datatype="int"/>
    <math result="@{start}" operation="+" operand1="${@{start}}" operand2="1" datatype="int"/>
    <var name="@{end}" value="${_GMLCS_leftContext_len}" />

    <var name="_GMLCS_modified_regex"       unset="true"/>
    <var name="_GMLCS_leftContext"          unset="true"/>
    <var name="_GMLCS_leftContext_len"      unset="true"/>
    <var name="_GMLCS_CapturedGroup"        unset="true"/>
    <var name="_GMLCS_CapturedGroup_len"    unset="true"/>
</sequential>

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