Added regex for user, mention, and tag parsing.

storage/content.go

@@ -0,0 +1,5 @@
+package storage
+
+var usernameRegex = `(\w+([\w\.-]+\w+)?)`
+var mentionRegex = `(@\w+([\w_\.-]+\w+)?@[\w\.-]*[\w])`
+var tagRegex = `(?:^|\B)([＃#]{1}(\w+))`

storage/content_test.go

@@ -0,0 +1,51 @@
+package storage
+
+import (
+	"regexp"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestActorRegex(t *testing.T) {
+	ur := regexp.MustCompile(usernameRegex)
+	mr := regexp.MustCompile(mentionRegex)
+	tr := regexp.MustCompile(tagRegex)
+
+	usernames := map[string]string{
+		"nick":        "nick",
+		"nick12345":   "nick12345",
+		"!nick":       "nick",
+		"nick!":       "nick",
+		"nick123nick": "nick123nick",
+	}
+
+	mentions := map[string]string{
+		"@nick@tavern.town":       "@nick@tavern.town",
+		"@nick1@tavern.town":      "@nick1@tavern.town",
+		"@nick!@tavern.town":      "",
+		"@nick!tavern.town":       "",
+		"@nick.tavern.town":       "",
+		"pre\n@nick@tavern.town":  "@nick@tavern.town",
+		"\n@nick@tavern.town":     "@nick@tavern.town",
+		"@nick@tavern.town, post": "@nick@tavern.town",
+	}
+
+	tags := map[string][]string{
+		"#what":        {"#what"},
+		"#what #what":  {"#what", "#what"},
+		"hello #world": {"#world"},
+		"hello#world":  nil,
+	}
+
+	for i, e := range usernames {
+		assert.Equalf(t, e, ur.FindString(i), "username '%s' matches '%s'", i, e)
+	}
+
+	for i, e := range mentions {
+		assert.Equalf(t, e, mr.FindString(i), "mention '%s' matches '%s'", i, e)
+	}
+	for i, e := range tags {
+		assert.Equalf(t, e, tr.FindAllString(i, -1), "tag '%s' matches '%s'", i, e)
+	}
+}