initial regex package

2 files changed, 85 insertions, 0 deletions

diff --git a/internal/regex/regex.go b/internal/regex/regex.go
new file mode 100644
index 0000000..35685a2
--- /dev/null
+++ b/internal/regex/regex.go
@@ -0,0 +1,69 @@
+package regex
+
+import (
+	"regexp"
+)
+
+type Flag int
+
+const (
+    // Default is the default regex mode (positive matching)
+    Default = iota
+    // Negative negates the regex 
+    Negative = iota
+    // Noop means no regex matching enabled, all defaults to true
+    Noop = iota
+)
+
+type Regex struct {
+    str string
+    re *regexp.Regexp
+    flag Flag
+}
+
+func (r Regex) Noop() Regex {
+    return Regex{
+        flag: Noop,
+    }
+}
+
+func New(str string, flag Flag) (Regex, error) {
+    r := Regex{
+        str:  str,
+        flag: flag,
+    }
+
+	re, err := regexp.Compile(str)
+
+	if err != nil {
+	    return r, err
+	}
+
+	r.re = re
+    return r, nil
+}
+
+func (r Regex) MatchString(str string) bool {
+    switch r.flag {
+    case Default:
+        return r.re.MatchString(str)
+    case Negative:
+        return !r.re.MatchString(str)
+    case Noop:
+        return true
+    default:
+        return false
+    }
+}
+
+/*
+func (r Regex) Serialize() string {
+    // TODO: Serialize to hex encoded str
+    return fmt.Sprintf("%b,%s",r.negate,r,str)
+}
+
+func (r Regex) Deserialize(input string) (Regex, error) {
+
+}
+
+*/
diff --git a/internal/regex/regex_test.go b/internal/regex/regex_test.go
new file mode 100644
index 0000000..a90aee2
--- /dev/null
+++ b/internal/regex/regex_test.go
@@ -0,0 +1,16 @@
+package regex
+
+import "testing"
+
+func TestRegex(t *testing.T) {
+
+    input := "hello"
+    r, err := New(".hello", Default)
+    if err != nil {
+		t.Errorf("error: unable to create regex: %v\n", err)
+    }
+
+    if r.MatchString(input) {
+		t.Errorf("error: expected to match string '%s' with regex '%v' but didnt\n", input, r)
+    }
+}