diff --git a/lexers/circular/php.go b/lexers/circular/php.go
index 517fb6907..e4bbc67d9 100644
--- a/lexers/circular/php.go
+++ b/lexers/circular/php.go
@@ -52,7 +52,7 @@ func phpCommonRules() Rules {
 			{`\d+e[+-]?[0-9]+`, LiteralNumberFloat, nil},
 			{`0[0-7]+`, LiteralNumberOct, nil},
 			{`0x[a-f0-9_]+`, LiteralNumberHex, nil},
-			{`[\d_]+`, LiteralNumberInteger, nil},
+			{`\d[\d_]*`, LiteralNumberInteger, nil},
 			{`0b[01]+`, LiteralNumberBin, nil},
 			{`'([^'\\]*(?:\\.[^'\\]*)*)'`, LiteralStringSingle, nil},
 			{"`([^`\\\\]*(?:\\\\.[^`\\\\]*)*)`", LiteralStringBacktick, nil},
diff --git a/lexers/j/javascript.go b/lexers/j/javascript.go
index 6bb3145c0..b624a53c2 100644
--- a/lexers/j/javascript.go
+++ b/lexers/j/javascript.go
@@ -30,7 +30,7 @@ var JavascriptRules = Rules{
 		{`0[bB][01]+`, LiteralNumberBin, nil},
 		{`0[oO][0-7]+`, LiteralNumberOct, nil},
 		{`0[xX][0-9a-fA-F]+`, LiteralNumberHex, nil},
-		{`[0-9_]+`, LiteralNumberInteger, nil},
+		{`[0-9][0-9_]*`, LiteralNumberInteger, nil},
 		{`\.\.\.|=>`, Punctuation, nil},
 		{`\+\+|--|~|&&|\?|:|\|\||\\(?=\n)|(<<|>>>?|==?|!=?|[-<>+*%&|^/])=?`, Operator, Push("slashstartsregex")},
 		{`[{(\[;,]`, Punctuation, Push("slashstartsregex")},