# Expressions

Input path

```//this digits
opdigits('.')

//this path
op:`opfullpath('.')`

//parent's digits, 0 is the input
opdigits("`opinputpath('.',0)`")

//string detail from the first input
`details(0, "myname")`

//from opname "node_MY" to "MY"
`strreplace(opname("."), "node_", "")`
```
###### Relative op: references inside POP VEX expression

The path after `op:` must be an absolute path (that is, starting from the root of the scene hierarchy with `/`). However, you can work around this by converting a relative path to an absolute path using the opfullpath expression function inside backticks:

`op:`opfullpath('../../volume1')``