XML Schema中的RegEx字符串驗證

創建RegEx表達式以在XML Schema中使用作爲字符串元素的限制有一點挑戰。XML Schema中的RegEx字符串驗證

所面臨的挑戰是，字符串（現在）可以包含以下值：

HASCALCULATOR，LISTUPDATENEEDED，READ ONLY和MANDATORY。

每個值只能出現一次，並且可以隨機排列。值由空格（空格）分隔。所有的值不需要存在。有效的字符串

例子：無效的字符串

HASCALCULATOR LISTUPDATENEEDED READ ONLY MANDATORY 
HASCALCULATOR READ ONLY 
READ ONLY HASCALCULATOR 
MANDATORY 
<Blank streng>

例子：

READ ONLY HASCALCULATOR READ ONLY 
SOMETHING READ ONLY 
READ ONLY SOMETHING HASCALCULATOR LISTUPDATENEEDED READ ONLY MANDATORY

我已經做了如下的表達式：

(HASCALCULATOR\s?|READONLY\s?|LISTUPDATENEEDED\s?|MANDATORY\s?){0,4}

不過，這並不涵蓋所有情況。例如，它允許重複一個值。如果有人能夠幫助我，並提出更好的表達，我將不勝感激。請注意與XML Schemas中的RegEx表達式相關的限制，這裏描述如下：http://www.regular-expressions.info/xml.html

來源

2013-08-07 mema

您有幾個選項。

（1）你可以強制你寫一個相當複雜的正則表達式，大意如下描述的約束：

與目前所有的四根弦每個合法值的某個置換的串聯序列（「HASCALCULATOR」，「只讀」，「列出來的」，「強制」）。

每個出現少於四個字符串的合法值都是某個排列串聯的前綴。

<xs:simpleType name="properties"> 
    <xs:restriction base="xs:string"> 
    <xs:whiteSpace value="collapse"/> 
    <xs:pattern value="((HASCALCULATOR (LISTUPDATENEEDED 
     (READ ONLY (MANDATORY)?)?)?)|(HASCALCULATOR 
     (LISTUPDATENEEDED (MANDATORY (READ ONLY)?)?)?)|(HASCALCULATOR 
     (READ ONLY (LISTUPDATENEEDED (MANDATORY)?)?)?)|(HASCALCULATOR 
     (READ ONLY (MANDATORY (LISTUPDATENEEDED)?)?)?)|(HASCALCULATOR 
     (MANDATORY (LISTUPDATENEEDED (READ ONLY)?)?)?)|(HASCALCULATOR 
     (MANDATORY (READ ONLY 
     (LISTUPDATENEEDED)?)?)?)|(LISTUPDATENEEDED (HASCALCULATOR 
     (READ ONLY (MANDATORY)?)?)?)|(LISTUPDATENEEDED (HASCALCULATOR 
     (MANDATORY (READ ONLY)?)?)?)|(LISTUPDATENEEDED (READ ONLY 
     (HASCALCULATOR (MANDATORY)?)?)?)|(LISTUPDATENEEDED (READ ONLY 
     (MANDATORY (HASCALCULATOR)?)?)?)|(LISTUPDATENEEDED (MANDATORY 
     (HASCALCULATOR (READ ONLY)?)?)?)|(LISTUPDATENEEDED (MANDATORY 
     (READ ONLY (HASCALCULATOR)?)?)?)|(READ ONLY (HASCALCULATOR 
     (LISTUPDATENEEDED (MANDATORY)?)?)?)|(READ ONLY (HASCALCULATOR 
     (MANDATORY (LISTUPDATENEEDED)?)?)?)|(READ ONLY 
     (LISTUPDATENEEDED (HASCALCULATOR (MANDATORY)?)?)?)|(READ ONLY 
     (LISTUPDATENEEDED (MANDATORY (HASCALCULATOR)?)?)?)|(READ ONLY 
     (MANDATORY (HASCALCULATOR (LISTUPDATENEEDED)?)?)?)|(READ ONLY 
     (MANDATORY (LISTUPDATENEEDED (HASCALCULATOR)?)?)?)|(MANDATORY 
     (HASCALCULATOR (LISTUPDATENEEDED (READ ONLY)?)?)?)|(MANDATORY 
     (HASCALCULATOR (READ ONLY (LISTUPDATENEEDED)?)?)?)|(MANDATORY 
     (LISTUPDATENEEDED (HASCALCULATOR (READ ONLY)?)?)?)|(MANDATORY 
     (LISTUPDATENEEDED (READ ONLY (HASCALCULATOR)?)?)?)|(MANDATORY 
     (READ ONLY (HASCALCULATOR (LISTUPDATENEEDED)?)?)?)|(MANDATORY 
     (READ ONLY (LISTUPDATENEEDED (HASCALCULATOR)?)?)?))?"> 
     <xs:annotation> 
     <xs:documentation> 
      The pattern here was calculated this way. 
      1 Let A = "HASCALCULATOR", B = "LISTUPDATENEEDED", 
      C = "READ ONLY", and D = "MANDATORY". 
      2 Calculate the permutations of the sequence (A,B,C,D). 
      A sequence with four members has 4! = 24 permutations: 
      (A,B,C,D), (A,B,D,C), (A,C,B,D), (A,C,D,B), ... 
      3 From each permutation generate a regex of the form 
      (s1 (s2 (s3 (s4)?)?)?) 
      4 Join all of these in single optional choice. 
     </xs:documentation> 
     </xs:annotation> 
    </xs:pattern> 
    </xs:restriction> 
</xs:simpleType>

（2）少可以通過左製作詳細的版本：

所以，你可以通過計算你的四根弦的24個排列，並使後綴可選寫出來的正則表達式在全融通脫節，讓喜歡

(A (B, (C, (D)?)?)?) 
|(A (B, (D, (C)?)?)?) 
|(A (C, (B, (D)?)?)?) 
|(A (C, (D, (B)?)?)?)

的構建變得像

(A ((B ((C D?)|(D C?))? 
    | (C ((B D?)|(D B?))?) 
    | (D ((B C?)|(C B?))?)))

（3）您可以重新考慮材料的表示形式。例如，你可以把四個字符串中任何一個字符串當作一個標誌並忽略重複;這將允許一個像你所繪製的模式一樣的模式。

（4）你可以代表標誌爲四個布爾屬性，因此，與其

<xs:element name="properties" type="tns:properties"/> 
<!--* assumes the declaration for 'properties' type 
    * given above *-->

你寫的東西，如：

<xs:element name="properties"> 
    <xs:complexType> 
    <xs:attribute name="has-calculator" type="xs:boolean"/> 
    <xs:attribute name="mandatory" type="xs:boolean"/> 
    <xs:attribute name="read-only" type="xs:boolean"/> 
    <xs:attribute name="list-update-needed" type="xs:boolean"/> 
    </xs:complexType> 
</xs:element>

（5）你可以代表標誌爲空元素，通過發生信號屬性：

<xs:complexType name="empty"> 
    <xs:sequence/> 
</xs:complexType> 
<xs:element name="properties"> 
    <xs:complexType> 
    <xs:all> 
     <xs:element name="has-calculator" 
        type="tns:empty" minOccurs="0"/> 
     <xs:element name="mandatory" 
        type="tns:empty" minOccurs="0"/> 
     <xs:element name="read-only" 
        type="tns:empty" minOccurs="0"/> 
     <xs:element name="list-update-needed" 
        type="tns:empty" minOccurs="0"/> 
    </xs:all> 
    </xs:complexType> 
</xs:element>

我傾向於使用選項（5），我自己。但是從問題的總體感覺來看，再加上全部大寫字符串，我想你正在處理來自完善系統的輸出，並且改變格式是不可行的。

來源

2013-08-13 00:03:59

XML Schema中的RegEx字符串驗證

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