util_regex_test
Test a regex pattern against text. Returns matches, groups, and count.
This record as markdown: /tools/io-github-davidmosiah-delx-mcp-server/util-regex-test.md
What util_regex_test does on Delx MCP Server
AI agents call util_regex_test to retrieve information from Delx MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
text | string | Yes | Text to test against |
flags | string | — | Optional flags: i=ignorecase, m=multiline, s=dotall |
pattern | string | Yes | Regular expression pattern |
Parameters from the server's own tool schema.
Why util_regex_test is rated Low
The tool performs pattern matching and returns results—a pure read operation with no side effects. It does not execute code, modify data, delete anything, or trigger external operations. While regex execution is technically computation, the confined scope (pattern testing against provided text) and deterministic output make this a safe read category.
From the tool's definition Tool description states: 'Test a regex pattern against text. Returns matches, groups, and count.' This is a query/test operation that retrieves information (regex matches) without modifying or executing arbitrary code based on dynamic arguments.
Attacks that exploit this kind of access
The rule that runs util_regex_test safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Delx MCP Server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For util_regex_test, this is the rule to start with:
util_regex_test is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Delx MCP Server, apply this rule, and every util_regex_test call is checked against it from then on.
Questions about util_regex_test
Test a regex pattern against text. Returns matches, groups, and count. It is categorised as a Read tool in the Delx MCP Server MCP Server, which means it retrieves data without modifying state.
util_regex_test accepts 3 parameters: text, flags, pattern. Required: text, pattern. The full parameter table on this page comes from the server's own tool schema.
Register the Delx MCP Server MCP server in PolicyLayer and add a rule for util_regex_test: 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 Delx MCP Server. Nothing to install.
util_regex_test is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the util_regex_test 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 util_regex_test. 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.
util_regex_test is provided by the Delx MCP Server MCP server (delx-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on Delx MCP Server, and thousands of servers like it.
This server
Across the catalogue