RegexLocate and RegexLocateUp (Stringlist functions): Difference between revisions

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<tr><th>%itemNum</th>
<tr><th>%itemNum</th>
<td>If specified, a numeric variable that is set to the number of the <var class="term">sl</var> item matched by <var class="term">regex</var>, or it is 0 if no items are matched.</td></tr>
<td>If specified, a numeric variable that is set to the number of the <var class="term">sl</var> item matched by <var class="term">regex</var>, or it is 0 if no items are matched.</td></tr>
<tr><th>sl</th>
<tr><th>sl</th><td>A <var>Stringlist</var> object.</td></tr>
<td>A <var>Stringlist</var> object.</td></tr>
<tr><th>regex</th><td>A string that is interpreted as a regular expression and is applied to the <var class="term">sl</var> method <var>Stringlist</var> items to determine whether the <var class="term">regex</var> finds a match.</td></tr>
<tr><th>regex</th>
<tr><th>startItem</th>
<td>A string that is interpreted as a regular expression and is applied to the <var class="term">sl</var> method <var>Stringlist</var> items to determine whether the <var class="term">regex</var> finds a match.</td></tr>
<tr><th><var>StartItem</var></th>
<td>The item number from which the <var class="term">regex</var> matching is to begin. If this item is not matched, the method attempts to match the item with the next higher (if <var>RegexLocate</var>) or lower (if <var>RegexLocateUp</var>) item number, and so on. This numeric value is an optional argument that defaults to 1 (if <var>RegexLocate</var>) or to the number of items in <var class="term">sl</var> (if <var>RegexLocateUp</var>). This value must not be negative and must not be greater than the number of <var class="term">sl</var> items. Setting this argument to 0 is the same as setting it to 1.</td></tr>
<td>The item number from which the <var class="term">regex</var> matching is to begin. If this item is not matched, the method attempts to match the item with the next higher (if <var>RegexLocate</var>) or lower (if <var>RegexLocateUp</var>) item number, and so on. This numeric value is an optional argument that defaults to 1 (if <var>RegexLocate</var>) or to the number of items in <var class="term">sl</var> (if <var>RegexLocateUp</var>). This value must not be negative and must not be greater than the number of <var class="term">sl</var> items. Setting this argument to 0 is the same as setting it to 1.</td></tr>
<tr><th><var>Options</var></th>
<tr><th><var>Options</var></th>
<td>This is an optional, but <var class="term">nameRequired</var>, parameter supplying a string of single letter options, which may be specified in uppercase or lowercase, in any combination, and blank separated or not as you prefer. For more information about these options, see <var>[[Regex_processing#Common_regex_options|"Common regex options"]]</var>.
<td>This is an optional, but [[Notation conventions for methods#Named parameters|name required]], parameter supplying a string of single letter options, which may be specified in uppercase or lowercase, in any combination, and blank separated or not as you prefer. For more information about these options, see <var>[[Regex_processing#Common_regex_options|"Common regex options"]]</var>.
<table class="syntaxNested">
<table class="syntaxNested">
<tr><th><var>I</var></th>
<tr><th><var>I</var></th>
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<td>Dot-All mode: a period (<code>.</code>) can match any character, including carriage return and linefeed.</td></tr>
<td>Dot-All mode: a period (<code>.</code>) can match any character, including carriage return and linefeed.</td></tr>
<tr><th><var>M</var></th>
<tr><th><var>M</var></th>
<td>Multi-line mode: let anchor characters match end-of-line indicators <b><i>wherever</i></b> the indicator appears in the input string.  <var class="term">M</var> mode is ignored if <var class="term">C</var> (XML Schema) mode is specified.</td></tr>
<td>Multi-line mode: let anchor characters match end-of-line indicators <b><i>wherever</i></b> the indicator appears in the input string.  <var>M</var> mode is ignored if <var>C</var> (XML Schema) mode is specified.</td></tr>
<tr><th><var>C</var></th>
<tr><th><var>C</var></th>
<td>Do the match according to <var>[[Regex_processing#XML_Schema_mode|"XML Schema regex rules"]]</var>.  Each <var class="term">regex</var> is implicitly anchored at the beginning and end, and no characters serve as anchors.</td></tr>
<td>Do the match according to <var>[[Regex_processing#XML_Schema_mode|"XML Schema regex rules"]]</var>.  Each <var class="term">regex</var> is implicitly anchored at the beginning and end, and no characters serve as anchors.</td></tr>
</table></td></tr>
</table></td></tr>
<tr><th><var>Status</var></th>
<tr><th><var>Status</var></th>
<td>The <var class="term">status</var> argument (name required) is optional; if specified, it is set to an integer code. These values are possible:
<td>The <var>Status</var> argument (name required) is optional; if specified, it is set to an integer code. These values are possible:
<table class="syntaxNested">
<table class="syntaxNested">
<tr><th><i>n</i></th>
<tr><th><i>n</i></th>
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<td>The <var class="term">startItem</var> value is invalid (either a negative value or a value greater than the number of list items), or the method <var>Stringlist</var> is empty.</td></tr>
<td>The <var class="term">startItem</var> value is invalid (either a negative value or a value greater than the number of list items), or the method <var>Stringlist</var> is empty.</td></tr>
<tr><th>-1<i>nnn</i></th>
<tr><th>-1<i>nnn</i></th>
<td>The pattern in <var class="term">regex</var> is invalid.  <i>nnn</i> (the absolute value of the return minus 1000) gives the 1-based position of the character being scanned when the error was discovered. The value for an error occurring at end-of-string is the length of the string + 1. Prior to Version 7.0 of the <var class=product>Sirius Mods</var>, an invalid regex results in a Status value of <code>-1</code>.</td></tr>
<td>The pattern in <var class="term">regex</var> is invalid.  <i>nnn</i> (the absolute value of the return minus 1000) gives the 1-based position of the character being scanned when the error was discovered. The value for an error occurring at end-of-string is the length of the string + 1. Prior to Version 7.0 of the <var class="product">Sirius Mods</var>, an invalid regex results in a <var>Status</var> value of <code>-1</code>.</td></tr>
</table>
</table>
<b>Note:</b> If you omit this argument and a negative <var class="term">status</var> value is to be returned, the request is cancelled.</td></tr>
<b>Note:</b> If you omit this argument and a negative <var>Status</var> value is to be returned, the request is cancelled.</td></tr>
<tr><th><var>StartCol</var></th>
<tr><th><var>StartCol</var></th>
<td>The <var>StartCol</var> argument (name required) is an optional <var class="term">number</var> that specifies the starting column of the range of columns in which the matched string must be located. If the argument is specified, its value must be greater than or equal to 1 and less than or equal to the <var class="term">EndCol</var> argument value. If the argument is omitted, its default value is 1. If you specify a value that is greater than the length of a particular <var class="term">sl</var> item, the <var class="term">regex</var> is matched against the empty string for that item.</td></tr>
<td>The <var>StartCol</var> argument (name required) is an optional <var class="term">number</var> that specifies the starting column of the range of columns in which the matched string must be located. If the argument is specified, its value must be greater than or equal to 1 and less than or equal to the <var>EndCol</var> argument value. If the argument is omitted, its default value is 1. If you specify a value that is greater than the length of a particular <var class="term">sl</var> item, the <var class="term">regex</var> is matched against the empty string for that item.</td></tr>
<tr><th><var>EndCol</var></th>
<tr><th><var>EndCol</var></th>
<td>The <var>EndCol</var> argument (name required) is an optional <var class="term">number</var> that specifies the ending column of the range of columns in which the matched string must be located. If the argument is specified, its value must be greater than or equal to 1, greater than or equal to the <var class="term">StartCol</var> argument value, and less than or equal to 6124. If the <var class="term">EndCol</var> argument is omitted, its default value is 6124.<p><b>Note:</b> If the <var>EndCol</var> argument is omitted and a <var class="term">sl</var> item exceeds 6124 bytes, the request is cancelled.</p></td></tr>
<td>The <var>EndCol</var> argument (name required) is an optional <var class="term">number</var> that specifies the ending column of the range of columns in which the matched string must be located. If the argument is specified, its value must be greater than or equal to 1, greater than or equal to the <var>StartCol</var> argument value, and less than or equal to 6124. If the <var>EndCol</var> argument is omitted, its default value is 6124.<p><b>Note:</b> If the <var>EndCol</var> argument is omitted and a <var class="term">sl</var> item exceeds 6124 bytes, the request is cancelled.</p></td></tr>
</table>
</table>


==Usage notes==
==Usage notes==
<ul><li>All errors in <var class="term">RegexLocate</var> / <var class="term">RegexLocateUp</var>, including invalid argument(s), will result in request cancellation.
<ul><li>All errors in <var>RegexLocate</var> or <var>RegexLocateUp</var>, including invalid argument(s), will result in request cancellation.
<li>It is strongly recommended that you protect your environment from regular expression processing demands on PDL and STBL space by setting, say, <code>UTABLE LPDLST 3000</code> and <code>UTABLE LSTBL 9000</code>. See <var>[[Regex_processing#User_Language_programming_considerations|"User Language programming considerations"]]</var>.
<li>It is strongly recommended that you protect your environment from regular expression processing demands on PDL and STBL space by setting, say, <code>UTABLE LPDLST 3000</code> and <code>UTABLE LSTBL 9000</code>. See <var>[[Regex_processing#User_Language_programming_considerations|"User Language programming considerations"]]</var>.
<li>The regex matching is limited to the first 6124 bytes of each item.
<li>The regex matching is limited to the first 6124 bytes of each item.
<li>The request is cancelled in any of these cases:<ul><li>You specify an invalid argument option.<li>You omit the <var class="term">Status</var> argument and a situation occurs that would cause a negative <var class="term">Status</var> value.<li>You omit the <var class="term">EndCol</var> argument and the length of an <var class="term">sl</var> item exceeds 6124 bytes.</ul><li>For information about additional methods and $functions that support regular expressions, see <var>[[Regex_processing|"Regex Processing"]]</var>.
<li>The request is cancelled in any of these cases:<ul><li>You specify an invalid argument option.<li>You omit the <var>Status</var> argument and a situation occurs that would cause a negative <var>Status</var> value.<li>You omit the <var>EndCol</var> argument and the length of an <var class="term">sl</var> item exceeds 6124 bytes.</ul>
<li>For information about additional methods and $functions that support regular expressions, see [[Regex_processing|"Regex Processing"]].
<li> These methods are available as of <var class="product">[[Sirius Mods|"Sirius Mods"]]</var> Version 6.9.</ul>
<li> These methods are available as of <var class="product">[[Sirius Mods|"Sirius Mods"]]</var> Version 6.9.</ul>



Revision as of 21:18, 13 April 2011

Find next/previous item in Stringlist that matches a regex (Stringlist class)


These methods use a regular expression (regex) to locate an item in the method Stringlist. They return the item number of the first item that the regex matches. Both methods proceed item-by-item through the Stringlist. RegexLocate starts, by default, from item 1, the first item in the Stringlist; or it starts from the item you specify. RegexLocateUp starts from the item n you specify and proceeds "upward" to item n-1, then n-2, and so on. RegexLocate and RegexLocateUp accept one required and five optional arguments, and may, optionally, return a number. They are callable methods.

Information about the regular expression matching rules observed is provided in "Regex processing rules".

Syntax

[%itemNum =] sl:RegexLocate( regex, [startItem], [Options= string], - [Status= %output], [StartCol= number], - [EndCol= number]) Throws InvalidRegex

[%itemNum =] sl:RegexLocateUp( regex, [startItem], [Options= string], - [Status= %output], [StartCol= number], - [EndCol= number]) Throws InvalidRegex

Syntax terms

%itemNum If specified, a numeric variable that is set to the number of the sl item matched by regex, or it is 0 if no items are matched.
slA Stringlist object.
regexA string that is interpreted as a regular expression and is applied to the sl method Stringlist items to determine whether the regex finds a match.
startItem The item number from which the regex matching is to begin. If this item is not matched, the method attempts to match the item with the next higher (if RegexLocate) or lower (if RegexLocateUp) item number, and so on. This numeric value is an optional argument that defaults to 1 (if RegexLocate) or to the number of items in sl (if RegexLocateUp). This value must not be negative and must not be greater than the number of sl items. Setting this argument to 0 is the same as setting it to 1.
Options This is an optional, but name required, parameter supplying a string of single letter options, which may be specified in uppercase or lowercase, in any combination, and blank separated or not as you prefer. For more information about these options, see "Common regex options".
I Do case-insensitive matching between string and regex.
S Dot-All mode: a period (.) can match any character, including carriage return and linefeed.
M Multi-line mode: let anchor characters match end-of-line indicators wherever the indicator appears in the input string. M mode is ignored if C (XML Schema) mode is specified.
C Do the match according to "XML Schema regex rules". Each regex is implicitly anchored at the beginning and end, and no characters serve as anchors.
Status The Status argument (name required) is optional; if specified, it is set to an integer code. These values are possible:
n The number of the sl item that is first matched.
0 No match: no items in sl were matched by regex.
-2 The startItem value is invalid (either a negative value or a value greater than the number of list items), or the method Stringlist is empty.
-1nnn The pattern in regex is invalid. nnn (the absolute value of the return minus 1000) gives the 1-based position of the character being scanned when the error was discovered. The value for an error occurring at end-of-string is the length of the string + 1. Prior to Version 7.0 of the Sirius Mods, an invalid regex results in a Status value of -1.
Note: If you omit this argument and a negative Status value is to be returned, the request is cancelled.
StartCol The StartCol argument (name required) is an optional number that specifies the starting column of the range of columns in which the matched string must be located. If the argument is specified, its value must be greater than or equal to 1 and less than or equal to the EndCol argument value. If the argument is omitted, its default value is 1. If you specify a value that is greater than the length of a particular sl item, the regex is matched against the empty string for that item.
EndCol The EndCol argument (name required) is an optional number that specifies the ending column of the range of columns in which the matched string must be located. If the argument is specified, its value must be greater than or equal to 1, greater than or equal to the StartCol argument value, and less than or equal to 6124. If the EndCol argument is omitted, its default value is 6124.

Note: If the EndCol argument is omitted and a sl item exceeds 6124 bytes, the request is cancelled.

Usage notes

  • All errors in RegexLocate or RegexLocateUp, including invalid argument(s), will result in request cancellation.
  • It is strongly recommended that you protect your environment from regular expression processing demands on PDL and STBL space by setting, say, UTABLE LPDLST 3000 and UTABLE LSTBL 9000. See "User Language programming considerations".
  • The regex matching is limited to the first 6124 bytes of each item.
  • The request is cancelled in any of these cases:
    • You specify an invalid argument option.
    • You omit the Status argument and a situation occurs that would cause a negative Status value.
    • You omit the EndCol argument and the length of an sl item exceeds 6124 bytes.
  • For information about additional methods and $functions that support regular expressions, see "Regex Processing".
  • These methods are available as of "Sirius Mods" Version 6.9.

Examples

  1. In the following code fragment, RegexLocate is applied to the method Stringlist %sl to find the first occurrence of the string 'CUST'. If this is successful, the containing item is copied to a new Stringlist. The matching is done case-insensitively, and the starting item is the beginning of the list, by default. Substituting RegexLocateUp for RegexLocate in the example would find the last occurrence of 'CUST'.

    ... %sl = new text to %sl %n = %list:findImageItem(%cust:ssn) if %n then %list:replaceImage(%n, 'CUST') else %list:addimage('CUST') end if end text %opt='i' %regex = cust %itemnum = %sl:RegexLocate(%regex, Options=%opt, Status=%st) If (%itemnum EQ 0) then Print 'Status from RegexLocate[Up] is ' %st Else Print %regex ' matches item ' %itemnum Print 'Now for %sl2 . . . ' %sl2 = new %i = %sl2:CopyItems(%sl, %itemnum, '1') %i = %sl2:Print End If ...

See also