regex_tester
Test a JavaScript regular expression against text and return every match with its captured groups. Runs on smart-tools.xyz.
This record as markdown: /tools/io-github-9thshini-smart-tools/regex-tester.md
What regex_tester does on SmartTools
AI agents invoke regex_tester to trigger actions in SmartTools. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.
| Parameter | Type | Required | Description |
|---|---|---|---|
text | string | Yes | The text to test against |
flags | string | — | Regex flags, any of gimsuy (default g) |
locale | string | — | Language for the source_url link (default en) |
pattern | string | Yes | The regular expression source (no delimiters) |
Parameters from the server's own tool schema.
Why regex_tester is rated High
regex_tester triggers real processes with real consequences. An agent gone sideways doesn't fire it once. It starts dozens of builds, sends mass notifications, or burns through compute before anyone looks up.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs regex_tester safely
PolicyLayer is an MCP gateway: it sits between your AI agents and SmartTools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For regex_tester, this is the rule to start with:
regex_tester stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect SmartTools, apply this rule, and every regex_tester call is checked against it from then on.
Questions about regex_tester
Test a JavaScript regular expression against text and return every match with its captured groups. Runs on smart-tools.xyz. It is categorised as a Execute tool in the SmartTools MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
regex_tester accepts 4 parameters: text, flags, locale, pattern. Required: text, pattern. The full parameter table on this page comes from the server's own tool schema.
Register the SmartTools MCP server in PolicyLayer and add a rule for regex_tester: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches SmartTools. Nothing to install.
regex_tester is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the regex_tester rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for regex_tester. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
regex_tester is provided by the SmartTools MCP server (https://smart-tools.xyz/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on SmartTools, and thousands of servers like it.
Across the catalogue