Question: I need to convert string to letter case (proper case or title case), is there any default function on Groovy support for this or I need to manual sub string convert first character?

Answer: 
```
assert org.apache.commons.lang.WordUtils.capitalizeFully('man OF stEEL') == 'Man Of Steel'

```

The `WordUtils` class is provided by Apache Commons Lang, which is available on the classpath of Grails apps by defatult
I got it, here is solution for those who needed

```
def capitalize(s) { s[0].toUpperCase() + s[1..-1].toLowerCase() }
caps = "man OF stEEL".replaceAll(/\w+/) { w -> capitalize(w) }

```