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This page describes the syntax for string literal expressions in PhixFlow.
All expressions in PhixFlow are written in the PhixFlow scripting language, //and every expression resolves to one of the following:
- A regular expresion, following the POSIX style
- A string literal expression
Regular expressions are used for text pattern-matching, whereas plain text expressions can be used both to do literal character matching and provide output values. In simple terms, writing a plain text expression for a string valued field on a stream would result in a (that) string being output to the database, but a regular expression would have no meaning in this context.
Examples:
If you want the string abc"def.
Use single quotes if you want to embed a double quote (or visa versa), or prefix the quote with a backslash:
e.g. 'abc"def' or "abc\"def".
Note how this contrasts to the regular expression case, where a double-backslash is used to escape special characters.
See Also
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Required output | Example Text Expression | ||
|---|---|---|---|
| Completed | "Completed" | ||
| abc"def | To embed a quote mark:
| ||
The account number ACC46242 failed | Generate a message including the current account number being processed, which is provided by _out.accountNumber:
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This message is finished. |
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Escaping Special Characters
When writing expressions you may need to enter a character that has special meaning. For example, a string could include a double-quote, but in the expression PhixFlow will read this as the end of the string. To tell PhixFlow to ignore a special character, you can use the backslash character.
You must use a backslast to escape any of the special characters listed in the table below.
| Character | Type | Escape string |
|---|---|---|
backspace | Represented As | "\b" |
| Escaped | "\\\\b" | |
| form feed | Represented As | "\f" |
| Escaped | "\\\\f" | |
| tab | Represented As | "\t" |
| Escaped | "\\\\t" | |
| carraige return | Represented As | "\r" |
| Escaped | "\\\\r" | |
| newline | Represented As | "\n" |
| Escaped | "\\\\n" | |
| backslash | Represented As |
|
| Escaped | "\\\\\\\\" | |
| double quote | Represented As | '"' |
| Escaped | '\\\\"' |
Example
The following macro escapes special characters.
| Code Block | ||
|---|---|---|
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do(
$value = $args[1],
$value = replaceAll( $value , "\b","\\\\b"),
$value = replaceAll( $value , "\f","\\\\f"),
$value = replaceAll( $value , "\t","\\\\t"),
$value = replaceAll( $value , "\r","\\\\r"),
$value = replaceAll( $value , "\n","\\\\n"),
$value = replaceAll( $value , "\\\\","\\\\\\\\"),
$value = replaceAll( $value , '"','\\\\"')
)
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