Add a regex parser

1 files changed, 15 insertions, 0 deletions

diff --git a/parser.go b/parser.go
index 7b45004..a23cef5 100644
--- a/parser.go
+++ b/parser.go
@@ -3,6 +3,7 @@ package goparsify
 import (
 	"errors"
 	"fmt"
+	"regexp"
 	"strings"
 	"unicode/utf8"
 )
@@ -102,6 +103,20 @@ func Run(parser Parserish, input string) (result interface{}, err error) {
 	return ret.Result, nil
 }
 
+// Regex returns a match if the regex successfully matches
+func Regex(pattern string) Parser {
+	re := regexp.MustCompile("^" + pattern)
+	return NewParser(pattern, func(ps *State) Result {
+		ps.AutoWS()
+		if match := re.FindString(ps.Get()); match != "" {
+			ps.Advance(len(match))
+			return Result{Token: match}
+		}
+		ps.ErrorHere(pattern)
+		return Result{}
+	})
+}
+
 // Exact will fully match the exact string supplied, or error. The match will be stored in .Token
 func Exact(match string) Parser {
 	if len(match) == 1 {