Regex Handling

Writing regular expressions for the Transparent Gateway and Payment Services

Overview

TokenEx's Transparent Gateway and Payment Services products utilize regular expressions for extracting merchant-specified data for tokenization and CVV association or generation of response parameters. These products handle regexes the same way: processing data returned by the regex's match or group[0]. Use the recommended tool of your choice below to build regexes for your application's use case.

To increase the specificity of a regex, utilize positive lookaheads and lookbehind operators. If attempting to use a positive lookahead that targets a key that is not a fixed length, consider chaining regexes with variations of that key via the | (or) operator.

Recommended Tools

• .Net Regex Tester - Regex Storm is the closest representation to how our platform processes regular expressions.
• Regexr: PCRE Engine is another favored tool, especially for sharing and troubleshooting.

Examples

Transparent Gateway

• Formatted JSON, capture a card number
• Minified JSON, capture a CVV

Payment Services

• Escaped JSON, capture a single letter.
• Escaped JSON, capture an object
• URL-Encoded Query String, capture a value
• XML, capture a word between tags
• XML, capture elements within an element