# `syntax.invalid_escape`

Unknown escape in a string.

Area 1, [Project layout and modules](../topics/project-layout-and-modules.md); not declinable; the next step is usually the agent's.

```jadpo
type Label = Text {
    pattern: "a\qb"
}
```

```text
error: `\q` isn't an escape Jadpo knows
 --> main.jadpo:2:16
  |
2 |     pattern: "a\qb"
  |                ^^ unknown escape
  reason: Inside a string, `\` starts one of `\"`, `\\`, `\n`, `\r` or `\t`.
  next: Write `\\q` for a backslash followed by `q` (agent)
  rule: syntax.invalid_escape
  help: https://jadpo.dev/docs/errors/syntax.invalid_escape

check failed: 1 error, 1 file
```