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Regex empty string or email
...hing an email address (that is, if you want wrong code that happens to (usually) work), use the regular-expressions.info link someone else submitted.
As for the empty string, ^$ is mentioned by multiple people and will work fine.
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How can I extract a good quality JPEG image from a video file with ffmpeg?
...ical file sizes and (to my naked eye) appear the same as without qscale at all.
– felwithe
Jan 28 '15 at 23:03
Can you...
App Inventor 2 动态图表教程 - ECharts与Chart组件实现实时曲线图 · App Inventor 2 中文网
...线
方案二：ECharts + WebView
HTML文件（echarts_dynamic.html）
App Inventor积木块
多条折线（ECharts）
实战案例：温度监测折线图
功能需求
积木块代码
常见问题
Q1: Chart组件数据多...
is it possible to update UIButton title/text programmatically?
...to update the title/text of the UIButton to reflect the new state. I'm calling:
12 Answers
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Ruby, remove last N characters from a string?
...alternative, and hope it helps people who land here. In fact, I've covered all this in the question - I'm hoping this method accepts a regex soon, though there's a perfect alternative for your case right below this.
– SRack
Sep 2 '19 at 15:07
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Java Equivalent of C# async/await?
I am a normal C# developer but occasionally I develop application in Java. I'm wondering if there is any Java equivalent of C# async/await?
In simple words what is the java equivalent of:
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What is the argument for printf that formats a long?
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Actually, you should change it to be %ld, to be more harmonic with OP question.
– DrBeco
Jun 21 '15 at 5:28
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Rake just one migration
...n a single migration that changed and needed to be re-run independently of all other migrations. Fire up the console and do this:
>> require 'db/migrate/your_migrations.rb'
=> ["YourMigrations"]
>> YourMigrations.up
=> etc... as the migration runs
>> YourMigration.down
Mor...
Ruby convert Object to Hash
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instance_values can be used for all ruby objects for the similar output.
– bishal
Jan 22 '19 at 11:37
add a comment
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Create space at the beginning of a UITextField
...but this is not the way. The reason you've to do it with a subclass is for all the edge cases. This code will probably crash before the subclass solution. But you are right that you shouldn't write code that is not strictly needed and can be provide by using the given libraries, but you shouldn't ab...