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---
title: Validating strings with regexes (Regex)
---
StrictYAML can validate regular expressions and return a
string. If the regular expression does not match, an
exception is raised.
```python
from strictyaml import Regex, Map, load, as_document
from collections import OrderedDict
from ensure import Ensure
schema = Map({"a": Regex(u"[1-4]"), "b": Regex(u"[5-9]")})
```
Parsed correctly:
```yaml
a: 1
b: 5
```
```python
Ensure(load(yaml_snippet, schema)).equals({"a": "1", "b": "5"})
```
Non-matching:
```yaml
a: 5
b: 5
```
```python
load(yaml_snippet, schema)
```
```python
strictyaml.exceptions.YAMLValidationError:
when expecting string matching [1-4]
found non-matching string
in "<unicode string>", line 1, column 1:
a: '5'
^ (line: 1)
```
Non-matching suffix:
```yaml
a: 1 Hello
b: 5
```
```python
load(yaml_snippet, schema)
```
```python
strictyaml.exceptions.YAMLValidationError:
when expecting string matching [1-4]
found non-matching string
in "<unicode string>", line 1, column 1:
a: 1 Hello
^ (line: 1)
```
Serialized successfully:
```python
print(as_document(OrderedDict([("a", "1"), ("b", "5")]), schema).as_yaml())
```
```yaml
a: 1
b: 5
```
Serialization failure non matching regex:
```python
as_document(OrderedDict([("a", "x"), ("b", "5")]), schema)
```
```python
strictyaml.exceptions.YAMLSerializationError:
when expecting string matching [1-4] found 'x'
```
Serialization failure not a string:
```python
as_document(OrderedDict([("a", 1), ("b", "5")]), schema)
```
```python
strictyaml.exceptions.YAMLSerializationError:
when expecting string matching [1-4] got '1' of type int.
```
!!! note "Executable specification"
Documentation automatically generated from
<a href="https://github.com/crdoconnor/strictyaml/blob/master/hitch/story/regexp.story">regexp.story
storytests.
|
