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This article mainly explains the "regular expression how to solve the problem of input box fixed input value format", the article explains the content is simple and clear, easy to learn and understand, now please follow Xiaobian's train of thought slowly in depth, together to study and learn "regular expression how to solve the input box fixed input value format problem" bar!

When using input for writing input, the following situations often occur:

You can only enter something. Chestnut: you can only enter numbers, only letters (uppercase, lowercase) can only be entered in a fixed format. Chestnut: you can only enter an amount, you can only enter a decimal number and a maximum of 2 digits can not be entered. Chestnut: you cannot enter special characters, such as "@ # ¥% & *".

In this case, it needs to be restricted directly on input, and regular expressions are mainly used to solve these problems in front-end applications.

The first case: you can only enter something

{{value}} export default {name: "app", data () {return {value:''} }, methods: {numCheck (val) {if (val! ='') {if (/ [^ 1-9] / .test (val)) {/ / drop ^ if you can't enter a number, / [1-9] / .test (val) / / can only enter letters, / [^ Amurz] / .test (val) / / can only enter letters or numbers (such as passwords) / [^ 1-9A-z] /) .test (val) this.$message ({type: "error", message: "only numbers can be entered, please re-enter!") this.value =''}

In the second case, you can only enter a fixed format.

Only two decimal places less than 1 can be entered

If (value > 1) {this.$message ({type: "error", message: "Please enter a number less than 1!"}) this.value =''return} if (! / ^ ([0-9] *) + (. [0-9] {1Magazine 2})? $/) .test (val) {this.$message ({type: "error", message: "Please enter two decimal places less than 1!"}) this.value =''}

Amount

If (value.length > 12) {this.$message ({type: "error", message: "length exceeds 12 Please re-enter "}) this.value =''return} if (! / / ^ [1-9] ([0-9] +)? (\. [0-9] {1 error})? $) | (^ (0) {1} $) | (^ [0-9]\. [0-9] ([0-9])? $) /) .test (value) {this.$message ({type:" error ", message:" only numbers can be entered. Please re-enter! "}) this.value =''}

In the third case, do not enter a

Var patrn = / [`~! @ # $% ^ & * _\-+ =? "{} |\;'\ [\] ~! @ # ¥%. & *-+ = {} |"? "[]',] / gim;if (patrn.test (val)) {this.$message ({type:" error ", message:" do not enter special characters! "})

Conclusion: it is very important to learn regular expressions!

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