(wip) regex match op

pkg/yqlib/doc/String Operators.md

@@ -1,47 +1,13 @@
 # String Operators
 
-## Match string
-Given a sample.yml file of:
-```yaml
-cat
-```
-then
-```bash
-yq eval 'match("at")' sample.yml
-```
-will output
-```yaml
-string: at
-offset: 1
-length: 2
-captures: []
-```
-
-## Match string, case insensitive
-Given a sample.yml file of:
-```yaml
-cAt
-```
-then
-```bash
-yq eval 'match("(?i)at")' sample.yml
-```
-will output
-```yaml
-string: At
-offset: 1
-length: 2
-captures: []
-```
-
-## Match with capture groups
+## Match with names capture groups
 Given a sample.yml file of:
 ```yaml
 a cat
 ```
 then
 ```bash
-yq eval 'match("c(.t)")' sample.yml
+yq eval 'match("c(?P<cool>.t)")' sample.yml
 ```
 will output
 ```yaml
@@ -52,5 +18,6 @@ captures:
   - string: at
     offset: 3
     length: 2
+    name: cool
 ```