github.com/aaabigfish/gopkg@v1.1.0/stringx/is.go (about) 1 // Copyright 2021 ByteDance Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package stringx 16 17 import ( 18 "unicode" 19 ) 20 21 // IsAlpha checks if the string contains only unicode letters. 22 func IsAlpha(s string) bool { 23 if s == "" { 24 return false 25 } 26 for _, v := range s { 27 if !unicode.IsLetter(v) { 28 return false 29 } 30 } 31 return true 32 } 33 34 // IsAlphanumeric checks if the string contains only Unicode letters or digits. 35 func IsAlphanumeric(s string) bool { 36 if s == "" { 37 return false 38 } 39 for _, v := range s { 40 if !isAlphanumeric(v) { 41 return false 42 } 43 } 44 return true 45 } 46 47 // IsNumeric Checks if the string contains only digits. A decimal point is not a digit and returns false. 48 func IsNumeric(s string) bool { 49 if s == "" { 50 return false 51 } 52 for _, v := range s { 53 if !unicode.IsDigit(v) { 54 return false 55 } 56 } 57 return true 58 } 59 60 func isAlphanumeric(v rune) bool { 61 return unicode.IsDigit(v) || unicode.IsLetter(v) 62 }