claude mcp add @muhammadalishahzad/regex-mcp -- npx -y @muhammadalishahzad/regex-mcp

{
  "mcpServers": {
    "regex": {
      "command": "npx",
      "args": ["-y", "@muhammadalishahzad/regex-mcp"]
    }
  }
}

{
  "mcpServers": {
    "regex": {
      "command": "npx",
      "args": ["-y", "@muhammadalishahzad/regex-mcp"]
    }
  }
}

{
  "servers": {
    "regex": {
      "command": "npx",
      "args": ["-y", "@muhammadalishahzad/regex-mcp"]
    }
  }
}

{
  "mcpServers": {
    "regex": {
      "command": "npx",
      "args": ["-y", "@muhammadalishahzad/regex-mcp"]
    }
  }
}

Pattern: \d+
Input:   "Order #123 has 4 items at $99.50"

Found 4 matches (8 chars, 25.0% of input)

Highlighted: Order #[123] has [4] items at $[99].[50]

Match 1:
  Text:     "123"
  Position: 7–10
  Length:   3

Match 2:
  Text:     "4"
  Position: 15–16
  Length:   1

Pattern: (?:https?://)([\w.-]+)(?:/(\w+))?

Breakdown:
  (?:          → start non-capturing group
    h          → literal 'h'
    t          → literal 't'
    t          → literal 't'
    p          → literal 'p'
    s          → literal 's'
    ?          → optional (zero or one)
    :          → literal ':'
    /          → literal '/'
    /          → literal '/'
  )            → end group
  (            → start capture group
    [\w.-]     → any character in [\w.-]
    +          → one or more times
  )            → end group
  (?:          → start non-capturing group
    /          → literal '/'
    (          → start capture group
      \w       → any word character (a-z, A-Z, 0-9, _)
      +        → one or more times
    )          → end group
  )            → end group
  ?            → optional (zero or one)

Pattern: ^.*foo.bar$
Flags:   g

Valid regex pattern.

Flags:
  g — global — find all matches

Warnings (3):
  1. Unescaped '.' matches ANY character. Did you mean '\.'?
  2. '.*' is greedy — it matches as much as possible. Consider '.*?'
  3. Using anchors (^/$) with global flag (g). Add 'm' for per-line matching.

Pattern: /^Hello/g
Input:   "hello world" (11 chars)

Result: No matches.

Hints:
  1. Case mismatch: With the 'i' flag, the pattern matches 1 time(s).

Found 2 matches:

  "Error on line 42: timeout. Error on line 99: crash."
   ^^^^^^^^^^^^^^^                ^^^^^^^^^^^^^^^^^^^^^

Match 1 [0–15]: "Error on line 42"
  Context: [Error on line 42]: timeout. Err...

Match 2 [27–52]: "Error on line 99: crash."
  Context: ...timeout. [Error on line 99: crash.]

Pattern:     (\w+), (\w+)
Input:       "Doe, John"
Replacement: $2 $1

Replacements: 1

Before:
Doe, John

After:
John Doe

Description: "email address"

Best match:
  Pattern: [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
  Description: Matches most common email address formats

git clone https://github.com/MuhammadAliShahzad/regex-mcp.git
cd regex-mcp
npm install
npm run build

npm run inspector

node build/index.js