Programmer Guide/Command Reference/STRCHR: Difference between revisions
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{{DISPLAYTITLE:{{SUBPAGENAME}}}} | {{DISPLAYTITLE:{{SUBPAGENAME}}}} | ||
<var>var</var> := STRCHR [ /Reverse ] [ [[Programmer_Guide/Command_Reference_Options/Silent|/Silent]] ] /- <var>needle</var> <var>haystackstring</var> | {{PG_StringCommands}} | ||
<var>var</var> := STRCHR [ /Reverse ] [ [[Programmer_Guide/Command_Reference_Options/Silent|/Silent]]] /Variable /- <var>needle</var> <var>haystackvariable</var> | <var>var</var> := STRCHR [ /Reverse ] [ [[Programmer_Guide/Command_Reference_Options/Silent|/Silent]] ] [[Programmer_Guide/Command_Reference_Options/-|/-]] <var>needle</var> <var>haystackstring</var> | ||
<var>var</var> := STRCHR [ /Reverse ] [ [[Programmer_Guide/Command_Reference_Options/Silent|/Silent]]] /Variable [[Programmer_Guide/Command_Reference_Options/-|/-]] <var>needle</var> <var>haystackvariable</var> | |||
Locates the first occurrence of the character <var>character</var>, or one of the characters in <var>characters</var> in the string <var>haystackstring</var> or, if <code>/Variable</code> is supplied, in the variable <var>haystackvariable</var>. and returns the index of the first occurrence, or -1, if no occurrence is found. | Locates the first occurrence of the character <var>character</var>, or one of the characters in <var>characters</var> in the string <var>haystackstring</var> or, if <code>/Variable</code> is supplied, in the variable <var>haystackvariable</var>. and returns the index of the first occurrence, or -1, if no occurrence is found. | ||
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;<code>/Variable</code> | ;<code>/Variable</code> | ||
:This option tells {{STX}} that the haystack argument is the name of a variable whose contents are to be searched. When omitting <code>/Variable</code>, the haystack argument will be considered a string literal to search. | :This option tells {{STX}} that the haystack argument is the name of a variable whose contents are to be searched. When omitting <code>/Variable</code>, the haystack argument will be considered a string literal to search. | ||
;<code>[[Programmer_Guide/Command_Reference_Options/-|/-]]</code> | |||
:The [[Programmer_Guide/Command_Reference_Options/-|"end of options" option]] tells {{STx}} that any further arguments are plain arguments, even should they start with a slash. You should always use this option in order to prevent - unless, of course, if you can be entirely sure that none of your arguments will start with a slash. | |||
;<var>needle</var> | ;<var>needle</var> | ||
:A string of characters, or a single character, to search for. | :A string of characters, or a single character, to search for. | ||
;<var> | ;<var>haystackvariable</var> | ||
:Find the first semi-colon in the string stored in the variable <var> | :Find the first semi-colon in the string stored in the variable <var>haystackvariable</var>. | ||
#v := set 'You must be joking ;-)' | #v := set 'You must be joking ;-)' | ||
#i := strchr / | #i := strchr /Variable [[Programmer_Guide/Command_Reference_Options/-|/-]] ';' '#v' | ||
// #i == 19 | // #i == 19 | ||
Latest revision as of 10:19, 4 March 2016
var := STRCHR [ /Reverse ] [ /Silent ] /- needle haystackstring var := STRCHR [ /Reverse ] [ /Silent] /Variable /- needle haystackvariable
Locates the first occurrence of the character character, or one of the characters in characters in the string haystackstring or, if /Variable is supplied, in the variable haystackvariable. and returns the index of the first occurrence, or -1, if no occurrence is found.
/Reverse- If option
/Reverseis supplied, the haystack will be searched from right to left; otherwise, it will be searched from left to right. /Silent- If option
/Silentis set, warnings instead of errors will be generated on failure /Variable- This option tells STx that the haystack argument is the name of a variable whose contents are to be searched. When omitting
/Variable, the haystack argument will be considered a string literal to search. /-- The "end of options" option tells STx that any further arguments are plain arguments, even should they start with a slash. You should always use this option in order to prevent - unless, of course, if you can be entirely sure that none of your arguments will start with a slash.
- needle
- A string of characters, or a single character, to search for.
- haystackvariable
- Find the first semi-colon in the string stored in the variable haystackvariable.
#v := set 'You must be joking ;-)' #i := strchr /Variable /- ';' '#v' // #i == 19
