Fix regular expression for syntax error detection

coffeelint also can't detect syntax error, but the jslint xml reason attribute has other format:

**Normal lint error**
```xml
<?xml version="1.0" encoding="utf-8"?><jslint>
<file name="stdin">
<issue line="39"
        lineEnd="39"
        reason="[error] Throwing strings is forbidden"
        evidence="undefined"/>
</file>
</jslint> 
```

**Syntax error**
```xml
<?xml version="1.0" encoding="utf-8"?><jslint>
<file name="stdin">
<issue line="31"
        lineEnd="31"
        reason="[error] [stdin]:31:21: error: unmatched }
    gymkhana, number} = Session.get &apos;quiz&apos;
                    ^"
        evidence="undefined"/>
</file>
</jslint> 
```